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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

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  • JonBJ JonB

    @CuriousPan
    There are many posts about this on this forum where people advise what to install, you could search. I think the most likely candidate you need to apt get is libxinerama, though it might be different for Qt6. And/or maybe libxcb-util?

    C Offline
    C Offline
    CuriousPan
    wrote on last edited by
    #3

    @JonB, I tried, but it turned out to be already installed, so no effect, unfortunately.

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #4

      Hi,

      Then start your application with the QT_DEBUG_PLUGINS environment variable set to 1 so you'll have more information about why it's failing to load.

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      C 1 Reply Last reply
      0
      • SGaistS SGaist

        Hi,

        Then start your application with the QT_DEBUG_PLUGINS environment variable set to 1 so you'll have more information about why it's failing to load.

        C Offline
        C Offline
        CuriousPan
        wrote on last edited by
        #5

        @SGaist Hello.
        Here's the more verbose output I got:

        QFactoryLoader::QFactoryLoader() checking directory path "/home/curiouspan/qt6-build/qtbase/plugins/platforms" ...
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqeglfs.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqeglfs.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "eglfs"
                ]
            },
            "archreq": 1,
            "className": "QEglFSIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("eglfs")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqlinuxfb.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqlinuxfb.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "linuxfb"
                ]
            },
            "archreq": 1,
            "className": "QLinuxFbIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("linuxfb")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimal.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimal.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "minimal"
                ]
            },
            "archreq": 1,
            "className": "QMinimalIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("minimal")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimalegl.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimalegl.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "minimalegl"
                ]
            },
            "archreq": 1,
            "className": "QMinimalEglIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("minimalegl")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqoffscreen.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqoffscreen.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "offscreen"
                ]
            },
            "archreq": 1,
            "className": "QOffscreenIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("offscreen")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqvnc.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqvnc.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "vnc"
                ]
            },
            "archreq": 1,
            "className": "QVncIntegrationPlugin",
            "debug": true,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("vnc")
        QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so"
        Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so, metadata=
        {
            "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
            "MetaData": {
                "Keys": [
                    "xcb"
                ]
            },
            "archreq": 0,
            "className": "QXcbIntegrationPlugin",
            "debug": false,
            "version": 393728
        }
        
        
        Got keys from plugin meta data QList("xcb")
        QFactoryLoader::QFactoryLoader() checking directory path "/home/curiouspan/QtTestProjects/build-WidgetTestApp-Own_Desktop-Debug/platforms" ...
        Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)
        QLibraryPrivate::loadPlugin failed on "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so" : "Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"
        qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
        This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
        
        Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
        
        jsulmJ 1 Reply Last reply
        0
        • C CuriousPan

          @SGaist Hello.
          Here's the more verbose output I got:

          QFactoryLoader::QFactoryLoader() checking directory path "/home/curiouspan/qt6-build/qtbase/plugins/platforms" ...
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqeglfs.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqeglfs.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "eglfs"
                  ]
              },
              "archreq": 1,
              "className": "QEglFSIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("eglfs")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqlinuxfb.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqlinuxfb.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "linuxfb"
                  ]
              },
              "archreq": 1,
              "className": "QLinuxFbIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("linuxfb")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimal.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimal.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "minimal"
                  ]
              },
              "archreq": 1,
              "className": "QMinimalIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("minimal")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimalegl.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqminimalegl.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "minimalegl"
                  ]
              },
              "archreq": 1,
              "className": "QMinimalEglIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("minimalegl")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqoffscreen.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqoffscreen.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "offscreen"
                  ]
              },
              "archreq": 1,
              "className": "QOffscreenIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("offscreen")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqvnc.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqvnc.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "vnc"
                  ]
              },
              "archreq": 1,
              "className": "QVncIntegrationPlugin",
              "debug": true,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("vnc")
          QFactoryLoader::QFactoryLoader() looking at "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so"
          Found metadata in lib /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "xcb"
                  ]
              },
              "archreq": 0,
              "className": "QXcbIntegrationPlugin",
              "debug": false,
              "version": 393728
          }
          
          
          Got keys from plugin meta data QList("xcb")
          QFactoryLoader::QFactoryLoader() checking directory path "/home/curiouspan/QtTestProjects/build-WidgetTestApp-Own_Desktop-Debug/platforms" ...
          Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)
          QLibraryPrivate::loadPlugin failed on "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so" : "Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"
          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
          
          Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
          
          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #6

          @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

          QLibraryPrivate::loadPlugin failed on "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so"

          Looks like the XCB platform plug-in is missing (libqxcb.so)

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          JKSHJ 1 Reply Last reply
          0
          • jsulmJ jsulm

            @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

            QLibraryPrivate::loadPlugin failed on "/home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so"

            Looks like the XCB platform plug-in is missing (libqxcb.so)

            JKSHJ Offline
            JKSHJ Offline
            JKSH
            Moderators
            wrote on last edited by
            #7

            @jsulm said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

            Looks like the XCB platform plug-in is missing (libqxcb.so)

            Or, one of its dependencies is missing.

            1. Run ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so
            2. Look for libraries that are marked "not found"
            3. Install those missing libraries.

            Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

            C 1 Reply Last reply
            0
            • hskoglundH Offline
              hskoglundH Offline
              hskoglund
              wrote on last edited by
              #8

              Hi, or rather, if you scroll to the right, it looks like libQt6XcbQpa.so.6 is missing:
              "... Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"

              JKSHJ 1 Reply Last reply
              1
              • hskoglundH hskoglund

                Hi, or rather, if you scroll to the right, it looks like libQt6XcbQpa.so.6 is missing:
                "... Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"

                JKSHJ Offline
                JKSHJ Offline
                JKSH
                Moderators
                wrote on last edited by
                #9

                @hskoglund said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                Hi, or rather, if you scroll to the right, it looks like libQt6XcbQpa.so.6 is missing:
                "... Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"

                Good spot.

                @CuriousPan, you say you built Qt from source. Check the configure summary and see if the XCB plugin was enabled.

                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                C 1 Reply Last reply
                0
                • JKSHJ JKSH

                  @hskoglund said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                  Hi, or rather, if you scroll to the right, it looks like libQt6XcbQpa.so.6 is missing:
                  "... Cannot load library /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so: (libQt6XcbQpa.so.6: cannot open shared object file: No such file or directory)"

                  Good spot.

                  @CuriousPan, you say you built Qt from source. Check the configure summary and see if the XCB plugin was enabled.

                  C Offline
                  C Offline
                  CuriousPan
                  wrote on last edited by
                  #10

                  @JKSH How can I do it?

                  JKSHJ 1 Reply Last reply
                  0
                  • C CuriousPan

                    @JKSH How can I do it?

                    JKSHJ Offline
                    JKSHJ Offline
                    JKSH
                    Moderators
                    wrote on last edited by
                    #11

                    @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                    @JKSH How can I do it?

                    When you ran the configure script at the start, it should have produced some log files. Have a look at the logs.

                    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                    C 1 Reply Last reply
                    0
                    • JKSHJ JKSH

                      @jsulm said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                      Looks like the XCB platform plug-in is missing (libqxcb.so)

                      Or, one of its dependencies is missing.

                      1. Run ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so
                      2. Look for libraries that are marked "not found"
                      3. Install those missing libraries.
                      C Offline
                      C Offline
                      CuriousPan
                      wrote on last edited by
                      #12

                      @JKSH, I entered the required command and here's the output I got

                      curiouspan@curiouspan-VirtualBox:~$ ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so
                      	linux-vdso.so.1 (0x00007fffc8770000)
                      	libQt6XcbQpa.so.6 => not found
                      	libQt6Gui.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007f0873306000)
                      	libQt6Core.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007f087295d000)
                      	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f087277c000)
                      	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f087258a000)
                      	libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f0872573000)
                      	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f0872436000)
                      	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0872430000)
                      	libQt6DBus.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007f0872262000)
                      	libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f087222e000)
                      	libOpenGL.so.0 => /lib/x86_64-linux-gnu/libOpenGL.so.0 (0x00007f0872202000)
                      	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f08721dd000)
                      	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f087208e000)
                      	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0872073000)
                      	/lib64/ld-linux-x86-64.so.2 (0x00007f08742b7000)
                      	libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f0871fbb000)
                      	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0871f91000)
                      	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f0871f89000)
                      	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f0871f81000)
                      	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f0871f67000)
                      
                      

                      How can I install this libQt6XcbQpa.so.6?

                      JonBJ JKSHJ 2 Replies Last reply
                      0
                      • C CuriousPan

                        @JKSH, I entered the required command and here's the output I got

                        curiouspan@curiouspan-VirtualBox:~$ ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so
                        	linux-vdso.so.1 (0x00007fffc8770000)
                        	libQt6XcbQpa.so.6 => not found
                        	libQt6Gui.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007f0873306000)
                        	libQt6Core.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007f087295d000)
                        	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f087277c000)
                        	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f087258a000)
                        	libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f0872573000)
                        	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f0872436000)
                        	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0872430000)
                        	libQt6DBus.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007f0872262000)
                        	libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f087222e000)
                        	libOpenGL.so.0 => /lib/x86_64-linux-gnu/libOpenGL.so.0 (0x00007f0872202000)
                        	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f08721dd000)
                        	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f087208e000)
                        	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0872073000)
                        	/lib64/ld-linux-x86-64.so.2 (0x00007f08742b7000)
                        	libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f0871fbb000)
                        	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0871f91000)
                        	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f0871f89000)
                        	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f0871f81000)
                        	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f0871f67000)
                        
                        

                        How can I install this libQt6XcbQpa.so.6?

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #13

                        @CuriousPan
                        @JKSH asked you to look at your configure log to see what you had set to build, since you are building Qt6 yourself, not downloading it.

                        C 1 Reply Last reply
                        0
                        • C CuriousPan

                          @JKSH, I entered the required command and here's the output I got

                          curiouspan@curiouspan-VirtualBox:~$ ldd /home/curiouspan/qt6-build/qtbase/plugins/platforms/libqxcb.so
                          	linux-vdso.so.1 (0x00007fffc8770000)
                          	libQt6XcbQpa.so.6 => not found
                          	libQt6Gui.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007f0873306000)
                          	libQt6Core.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007f087295d000)
                          	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f087277c000)
                          	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f087258a000)
                          	libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f0872573000)
                          	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f0872436000)
                          	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0872430000)
                          	libQt6DBus.so.6 => /home/curiouspan/qt6-build/qtbase/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007f0872262000)
                          	libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f087222e000)
                          	libOpenGL.so.0 => /lib/x86_64-linux-gnu/libOpenGL.so.0 (0x00007f0872202000)
                          	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f08721dd000)
                          	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f087208e000)
                          	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f0872073000)
                          	/lib64/ld-linux-x86-64.so.2 (0x00007f08742b7000)
                          	libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f0871fbb000)
                          	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0871f91000)
                          	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f0871f89000)
                          	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f0871f81000)
                          	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f0871f67000)
                          
                          

                          How can I install this libQt6XcbQpa.so.6?

                          JKSHJ Offline
                          JKSHJ Offline
                          JKSH
                          Moderators
                          wrote on last edited by
                          #14

                          @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                          How can I install this libQt6XcbQpa.so.6?

                          This is part of Qt.

                          Since your build was missing libQt6XcbQpa.so and libqxcb.so, it probably means your system did not fulfil the requirements to build Qt's XCB plugin (again, check your configure log)

                          You might be able to get a copy of libQt6XcbQpa.so from your colleague, but it would be better to find out why it didn't build in the first place.

                          Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                          C 1 Reply Last reply
                          2
                          • JKSHJ JKSH

                            @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                            How can I install this libQt6XcbQpa.so.6?

                            This is part of Qt.

                            Since your build was missing libQt6XcbQpa.so and libqxcb.so, it probably means your system did not fulfil the requirements to build Qt's XCB plugin (again, check your configure log)

                            You might be able to get a copy of libQt6XcbQpa.so from your colleague, but it would be better to find out why it didn't build in the first place.

                            C Offline
                            C Offline
                            CuriousPan
                            wrote on last edited by CuriousPan
                            #15

                            @JKSH Where this file should be located? My collegue cannot find it.

                            1 Reply Last reply
                            0
                            • JonBJ JonB

                              @CuriousPan
                              @JKSH asked you to look at your configure log to see what you had set to build, since you are building Qt6 yourself, not downloading it.

                              C Offline
                              C Offline
                              CuriousPan
                              wrote on last edited by
                              #16

                              @JonB, how can I see configure log? Is there some log file?

                              jsulmJ 1 Reply Last reply
                              0
                              • C CuriousPan

                                @JonB, how can I see configure log? Is there some log file?

                                jsulmJ Offline
                                jsulmJ Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #17

                                @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                how can I see configure log? Is there some log file?

                                Its config.log text file in the folder where you called configure...

                                https://forum.qt.io/topic/113070/qt-code-of-conduct

                                C 1 Reply Last reply
                                1
                                • jsulmJ jsulm

                                  @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                  how can I see configure log? Is there some log file?

                                  Its config.log text file in the folder where you called configure...

                                  C Offline
                                  C Offline
                                  CuriousPan
                                  wrote on last edited by
                                  #18

                                  @jsulm, undertood. Anyway, do you know where the mentioned libQt6XcbQpa.so can be located? My collegue cannot find it.

                                  1 Reply Last reply
                                  0
                                  • JKSHJ JKSH

                                    @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                    @JKSH How can I do it?

                                    When you ran the configure script at the start, it should have produced some log files. Have a look at the logs.

                                    C Offline
                                    C Offline
                                    CuriousPan
                                    wrote on last edited by
                                    #19

                                    @jsulm, Hello.
                                    I have found configure.summary file. Here's the content for it. Is this what you meant?

                                    Building for: linux-g++ (x86_64, CPU features: mmx sse sse2)
                                    Compiler: gcc 9.3.0
                                    Build options:
                                      Mode ................................... debug
                                      Optimize debug build ................... no
                                      Fully optimize release builds (-O3) .... no
                                      Building shared libraries .............. yes
                                      Using C standard ....................... C11
                                      Using C++ standard ..................... C++17
                                      Using ccache ........................... no
                                      Using new DTAGS ........................ yes
                                      Generating GDB index ................... no
                                      Relocatable ............................ yes
                                      Using precompiled headers .............. yes
                                      Using LTCG ............................. no
                                      Target compiler supports:
                                        SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
                                        AVX .................................. AVX AVX2
                                        AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
                                        Other x86 ............................ AES F16C RDRAND SHA
                                        Intrinsics without compiler architecture option  yes
                                      Sanitizers:
                                        Addresses ............................ no
                                        Threads .............................. no
                                        Memory ............................... no
                                        Fuzzer (instrumentation only) ........ no
                                        Undefined ............................ no
                                      Build parts ............................ libs tools
                                    Qt modules and options:
                                      Qt Concurrent .......................... yes
                                      Qt D-Bus ............................... yes
                                      Qt D-Bus directly linked to libdbus .... no
                                      Qt Gui ................................. yes
                                      Qt Network ............................. yes
                                      Qt Sql ................................. yes
                                      Qt Testlib ............................. yes
                                      Qt Widgets ............................. yes
                                      Qt Xml ................................. yes
                                    Support enabled for:
                                      Using pkg-config ....................... yes
                                      udev ................................... no
                                      Using system zlib ...................... no
                                      Zstandard support ...................... no
                                      Thread support ......................... yes
                                    Qt Core:
                                      backtrace .............................. yes
                                      DoubleConversion ....................... yes
                                        Using system DoubleConversion ........ no
                                      GLib ................................... no
                                      ICU .................................... no
                                      Using system libb2 ..................... no
                                      Built-in copy of the MIME database ..... yes
                                      Tracing backend ........................ <none>
                                      Logging backends:
                                        journald ............................. no
                                        syslog ............................... no
                                        slog2 ................................ no
                                      PCRE2 .................................. yes
                                        Using system PCRE2 ................... no
                                      CLONE_PIDFD support in forkfd .......... yes
                                    Qt Sql:
                                      SQL item models ........................ yes
                                    Qt Network:
                                      getifaddrs() ........................... yes
                                      IPv6 ifname ............................ yes
                                      libproxy ............................... no
                                      Linux AF_NETLINK ....................... yes
                                      OpenSSL ................................ no
                                        Qt directly linked to OpenSSL ........ no
                                      OpenSSL 1.1 ............................ no
                                      DTLS ................................... no
                                      OCSP-stapling .......................... no
                                      SCTP ................................... no
                                      Use system proxies ..................... yes
                                      GSSAPI ................................. no
                                      Brotli Decompression Support ........... no
                                    Qt Gui:
                                      Accessibility .......................... yes
                                      FreeType ............................... yes
                                        Using system FreeType ................ no
                                      HarfBuzz ............................... yes
                                        Using system HarfBuzz ................ no
                                      Fontconfig ............................. no
                                      Image formats:
                                        GIF .................................. yes
                                        ICO .................................. yes
                                        JPEG ................................. yes
                                          Using system libjpeg ............... no
                                        PNG .................................. yes
                                          Using system libpng ................ no
                                      Text formats:
                                        HtmlParser ........................... yes
                                        CssParser ............................ yes
                                        OdfWriter ............................ yes
                                        MarkdownReader ....................... yes
                                          Using system libmd4c ............... no
                                        MarkdownWriter ....................... yes
                                      EGL .................................... yes
                                      OpenVG ................................. no
                                      OpenGL:
                                        Desktop OpenGL ....................... yes
                                        OpenGL ES 2.0 ........................ no
                                        OpenGL ES 3.0 ........................ no
                                        OpenGL ES 3.1 ........................ no
                                        OpenGL ES 3.2 ........................ no
                                      Vulkan ................................. no
                                      Session Management ..................... yes
                                    Features used by QPA backends:
                                      evdev .................................. yes
                                      libinput ............................... no
                                      INTEGRITY HID .......................... no
                                      mtdev .................................. no
                                      tslib .................................. no
                                      xkbcommon .............................. no
                                      X11 specific:
                                        XLib ................................. yes
                                        XCB Xlib ............................. no
                                        EGL on X11 ........................... yes
                                        xkbcommon-x11 ........................ no
                                    QPA backends:
                                      DirectFB ............................... no
                                      EGLFS .................................. yes
                                      EGLFS details:
                                        EGLFS OpenWFD ........................ no
                                        EGLFS i.Mx6 .......................... no
                                        EGLFS i.Mx6 Wayland .................. no
                                        EGLFS RCAR ........................... no
                                        EGLFS EGLDevice ...................... no
                                        EGLFS GBM ............................ no
                                        EGLFS VSP2 ........................... no
                                        EGLFS Mali ........................... no
                                        EGLFS Raspberry Pi ................... no
                                        EGLFS X11 ............................ no
                                      LinuxFB ................................ yes
                                      VNC .................................... yes
                                      VK_KHR_display ......................... no
                                      QNX:
                                        lgmon ................................ no
                                        IMF .................................. no
                                      XCB:
                                        Using system-provided xcb-xinput ..... no
                                        GL integrations:
                                          GLX Plugin ......................... no
                                            XCB GLX .......................... no
                                          EGL-X11 Plugin ..................... yes
                                      Windows:
                                        Direct 2D ............................ no
                                        Direct 2D 1.1 ........................ no
                                        DirectWrite .......................... no
                                        DirectWrite 3 ........................ no
                                    Qt Widgets:
                                      GTK+ ................................... no
                                      Styles ................................. Fusion Windows
                                    Qt Testlib:
                                      Tester for item models ................. yes
                                    Qt PrintSupport:
                                      CUPS ................................... no
                                    Qt Sql Drivers:
                                      DB2 (IBM) .............................. no
                                      InterBase .............................. no
                                      MySql .................................. no
                                      OCI (Oracle) ........................... no
                                      ODBC ................................... no
                                      PostgreSQL ............................. no
                                      SQLite ................................. yes
                                        Using system provided SQLite ......... no
                                    Core tools:
                                      qmake tool ............................. yes
                                    Qt QML:
                                      QML network support .................... yes
                                      QML debugging and profiling support .... yes
                                      QML just-in-time compiler .............. yes
                                      QML sequence object .................... yes
                                      QML XML http request ................... yes
                                      QML Locale ............................. yes
                                    Qt QML Models:
                                      QML list model ......................... yes
                                      QML delegate model ..................... yes
                                    Qt Quick:
                                      AnimatedImage item ..................... yes
                                      Canvas item ............................ yes
                                      Support for Qt Quick Designer .......... yes
                                      Flipable item .......................... yes
                                      GridView item .......................... yes
                                      ListView item .......................... yes
                                      TableView item ......................... yes
                                      Path support ........................... yes
                                      PathView item .......................... yes
                                      Positioner items ....................... yes
                                      Repeater item .......................... yes
                                      ShaderEffect item ...................... yes
                                      Sprite item ............................ yes
                                    Qt Quick Templates 2:
                                      Hover support .......................... yes
                                      Multi-touch support .................... yes
                                    Qt Quick Controls 2:
                                      Styles ................................. Basic Fusion Imagine Material Universal macOS Windows
                                    
                                    JKSHJ 1 Reply Last reply
                                    0
                                    • C CuriousPan

                                      @jsulm, Hello.
                                      I have found configure.summary file. Here's the content for it. Is this what you meant?

                                      Building for: linux-g++ (x86_64, CPU features: mmx sse sse2)
                                      Compiler: gcc 9.3.0
                                      Build options:
                                        Mode ................................... debug
                                        Optimize debug build ................... no
                                        Fully optimize release builds (-O3) .... no
                                        Building shared libraries .............. yes
                                        Using C standard ....................... C11
                                        Using C++ standard ..................... C++17
                                        Using ccache ........................... no
                                        Using new DTAGS ........................ yes
                                        Generating GDB index ................... no
                                        Relocatable ............................ yes
                                        Using precompiled headers .............. yes
                                        Using LTCG ............................. no
                                        Target compiler supports:
                                          SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
                                          AVX .................................. AVX AVX2
                                          AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
                                          Other x86 ............................ AES F16C RDRAND SHA
                                          Intrinsics without compiler architecture option  yes
                                        Sanitizers:
                                          Addresses ............................ no
                                          Threads .............................. no
                                          Memory ............................... no
                                          Fuzzer (instrumentation only) ........ no
                                          Undefined ............................ no
                                        Build parts ............................ libs tools
                                      Qt modules and options:
                                        Qt Concurrent .......................... yes
                                        Qt D-Bus ............................... yes
                                        Qt D-Bus directly linked to libdbus .... no
                                        Qt Gui ................................. yes
                                        Qt Network ............................. yes
                                        Qt Sql ................................. yes
                                        Qt Testlib ............................. yes
                                        Qt Widgets ............................. yes
                                        Qt Xml ................................. yes
                                      Support enabled for:
                                        Using pkg-config ....................... yes
                                        udev ................................... no
                                        Using system zlib ...................... no
                                        Zstandard support ...................... no
                                        Thread support ......................... yes
                                      Qt Core:
                                        backtrace .............................. yes
                                        DoubleConversion ....................... yes
                                          Using system DoubleConversion ........ no
                                        GLib ................................... no
                                        ICU .................................... no
                                        Using system libb2 ..................... no
                                        Built-in copy of the MIME database ..... yes
                                        Tracing backend ........................ <none>
                                        Logging backends:
                                          journald ............................. no
                                          syslog ............................... no
                                          slog2 ................................ no
                                        PCRE2 .................................. yes
                                          Using system PCRE2 ................... no
                                        CLONE_PIDFD support in forkfd .......... yes
                                      Qt Sql:
                                        SQL item models ........................ yes
                                      Qt Network:
                                        getifaddrs() ........................... yes
                                        IPv6 ifname ............................ yes
                                        libproxy ............................... no
                                        Linux AF_NETLINK ....................... yes
                                        OpenSSL ................................ no
                                          Qt directly linked to OpenSSL ........ no
                                        OpenSSL 1.1 ............................ no
                                        DTLS ................................... no
                                        OCSP-stapling .......................... no
                                        SCTP ................................... no
                                        Use system proxies ..................... yes
                                        GSSAPI ................................. no
                                        Brotli Decompression Support ........... no
                                      Qt Gui:
                                        Accessibility .......................... yes
                                        FreeType ............................... yes
                                          Using system FreeType ................ no
                                        HarfBuzz ............................... yes
                                          Using system HarfBuzz ................ no
                                        Fontconfig ............................. no
                                        Image formats:
                                          GIF .................................. yes
                                          ICO .................................. yes
                                          JPEG ................................. yes
                                            Using system libjpeg ............... no
                                          PNG .................................. yes
                                            Using system libpng ................ no
                                        Text formats:
                                          HtmlParser ........................... yes
                                          CssParser ............................ yes
                                          OdfWriter ............................ yes
                                          MarkdownReader ....................... yes
                                            Using system libmd4c ............... no
                                          MarkdownWriter ....................... yes
                                        EGL .................................... yes
                                        OpenVG ................................. no
                                        OpenGL:
                                          Desktop OpenGL ....................... yes
                                          OpenGL ES 2.0 ........................ no
                                          OpenGL ES 3.0 ........................ no
                                          OpenGL ES 3.1 ........................ no
                                          OpenGL ES 3.2 ........................ no
                                        Vulkan ................................. no
                                        Session Management ..................... yes
                                      Features used by QPA backends:
                                        evdev .................................. yes
                                        libinput ............................... no
                                        INTEGRITY HID .......................... no
                                        mtdev .................................. no
                                        tslib .................................. no
                                        xkbcommon .............................. no
                                        X11 specific:
                                          XLib ................................. yes
                                          XCB Xlib ............................. no
                                          EGL on X11 ........................... yes
                                          xkbcommon-x11 ........................ no
                                      QPA backends:
                                        DirectFB ............................... no
                                        EGLFS .................................. yes
                                        EGLFS details:
                                          EGLFS OpenWFD ........................ no
                                          EGLFS i.Mx6 .......................... no
                                          EGLFS i.Mx6 Wayland .................. no
                                          EGLFS RCAR ........................... no
                                          EGLFS EGLDevice ...................... no
                                          EGLFS GBM ............................ no
                                          EGLFS VSP2 ........................... no
                                          EGLFS Mali ........................... no
                                          EGLFS Raspberry Pi ................... no
                                          EGLFS X11 ............................ no
                                        LinuxFB ................................ yes
                                        VNC .................................... yes
                                        VK_KHR_display ......................... no
                                        QNX:
                                          lgmon ................................ no
                                          IMF .................................. no
                                        XCB:
                                          Using system-provided xcb-xinput ..... no
                                          GL integrations:
                                            GLX Plugin ......................... no
                                              XCB GLX .......................... no
                                            EGL-X11 Plugin ..................... yes
                                        Windows:
                                          Direct 2D ............................ no
                                          Direct 2D 1.1 ........................ no
                                          DirectWrite .......................... no
                                          DirectWrite 3 ........................ no
                                      Qt Widgets:
                                        GTK+ ................................... no
                                        Styles ................................. Fusion Windows
                                      Qt Testlib:
                                        Tester for item models ................. yes
                                      Qt PrintSupport:
                                        CUPS ................................... no
                                      Qt Sql Drivers:
                                        DB2 (IBM) .............................. no
                                        InterBase .............................. no
                                        MySql .................................. no
                                        OCI (Oracle) ........................... no
                                        ODBC ................................... no
                                        PostgreSQL ............................. no
                                        SQLite ................................. yes
                                          Using system provided SQLite ......... no
                                      Core tools:
                                        qmake tool ............................. yes
                                      Qt QML:
                                        QML network support .................... yes
                                        QML debugging and profiling support .... yes
                                        QML just-in-time compiler .............. yes
                                        QML sequence object .................... yes
                                        QML XML http request ................... yes
                                        QML Locale ............................. yes
                                      Qt QML Models:
                                        QML list model ......................... yes
                                        QML delegate model ..................... yes
                                      Qt Quick:
                                        AnimatedImage item ..................... yes
                                        Canvas item ............................ yes
                                        Support for Qt Quick Designer .......... yes
                                        Flipable item .......................... yes
                                        GridView item .......................... yes
                                        ListView item .......................... yes
                                        TableView item ......................... yes
                                        Path support ........................... yes
                                        PathView item .......................... yes
                                        Positioner items ....................... yes
                                        Repeater item .......................... yes
                                        ShaderEffect item ...................... yes
                                        Sprite item ............................ yes
                                      Qt Quick Templates 2:
                                        Hover support .......................... yes
                                        Multi-touch support .................... yes
                                      Qt Quick Controls 2:
                                        Styles ................................. Basic Fusion Imagine Material Universal macOS Windows
                                      
                                      JKSHJ Offline
                                      JKSHJ Offline
                                      JKSH
                                      Moderators
                                      wrote on last edited by
                                      #20

                                      @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                      Features used by QPA backends:
                                      ...
                                        xkbcommon .............................. no
                                        X11 specific:
                                          XLib ................................. yes
                                          XCB Xlib ............................. no
                                          EGL on X11 ........................... yes
                                          xkbcommon-x11 ........................ no
                                      ...
                                      QPA backends:
                                      ...
                                        XCB:
                                          Using system-provided xcb-xinput ..... no
                                          GL integrations:
                                            GLX Plugin ......................... no
                                              XCB GLX .......................... no
                                            EGL-X11 Plugin ..................... yes
                                      

                                      You need "yes" on all of these. "no" means you were missing the dependencies.

                                      You should:

                                      1. Clean out your build tree (i.e. delete all files that were not part of the original source code)
                                      2. Install all the dependencies for Ubuntu at https://wiki.qt.io/Building_Qt_5_from_Git (pay particular attention to the "Libxcb" section)
                                      3. Run configure again. Make sure you get "yes" on all of the above.
                                      4. Run make to build Qt.

                                      You should now have all the XCB-related libraries.

                                      Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                      C 1 Reply Last reply
                                      2
                                      • JKSHJ JKSH

                                        @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                        Features used by QPA backends:
                                        ...
                                          xkbcommon .............................. no
                                          X11 specific:
                                            XLib ................................. yes
                                            XCB Xlib ............................. no
                                            EGL on X11 ........................... yes
                                            xkbcommon-x11 ........................ no
                                        ...
                                        QPA backends:
                                        ...
                                          XCB:
                                            Using system-provided xcb-xinput ..... no
                                            GL integrations:
                                              GLX Plugin ......................... no
                                                XCB GLX .......................... no
                                              EGL-X11 Plugin ..................... yes
                                        

                                        You need "yes" on all of these. "no" means you were missing the dependencies.

                                        You should:

                                        1. Clean out your build tree (i.e. delete all files that were not part of the original source code)
                                        2. Install all the dependencies for Ubuntu at https://wiki.qt.io/Building_Qt_5_from_Git (pay particular attention to the "Libxcb" section)
                                        3. Run configure again. Make sure you get "yes" on all of the above.
                                        4. Run make to build Qt.

                                        You should now have all the XCB-related libraries.

                                        C Offline
                                        C Offline
                                        CuriousPan
                                        wrote on last edited by
                                        #21

                                        @JKSH, thank you for response. I will try mentioned steps. But is it relevant for Qt6 too?

                                        JKSHJ 1 Reply Last reply
                                        0
                                        • C CuriousPan

                                          @JKSH, thank you for response. I will try mentioned steps. But is it relevant for Qt6 too?

                                          JKSHJ Offline
                                          JKSHJ Offline
                                          JKSH
                                          Moderators
                                          wrote on last edited by
                                          #22

                                          @CuriousPan said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                                          @JKSH, thank you for response. I will try mentioned steps. But is it relevant for Qt6 too?

                                          You're welcome.

                                          Yes, I believe the XCB requirements for Qt 5 and Qt 6 are very similar (or even identical)

                                          Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                          C 1 Reply Last reply
                                          3

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