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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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  • SGaistS SGaist

    Hi,

    Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

    By default you should not even need to use that variable.

    M Offline
    M Offline
    mywings19
    wrote on last edited by
    #136

    @SGaist
    Me?That might be the problem

    When I point the Qt plugin path, 'xcb' couldn't be found
    sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    Available platform plugins are: linuxfb, minimal, offscreen, vnc.

    So shall I reinstall the Qt or add some plugins?
    Thank you

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #137

      Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

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

      M 1 Reply Last reply
      1
      • SGaistS SGaist

        Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

        M Offline
        M Offline
        mywings19
        wrote on last edited by mywings19
        #138

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

        Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

        I've set the QT_DEBUG_PLUGINS environment variable in the .bashrc file and sourced it. See floor.134
        But these is no error message while loading qtcreator.

        sugon@EC:~$ echo $QT_DEBUG_PLUGINS
        1
        sugon@EC:~$

        1 Reply Last reply
        0
        • hskoglundH Offline
          hskoglundH Offline
          hskoglund
          wrote on last edited by
          #139

          Hi, perhaps you are launching Qt Creator by double clicking on it?
          If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

          M 1 Reply Last reply
          0
          • hskoglundH hskoglund

            Hi, perhaps you are launching Qt Creator by double clicking on it?
            If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

            M Offline
            M Offline
            mywings19
            wrote on last edited by
            #140

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

            Hi, perhaps you are launching Qt Creator by double clicking on it?
            If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

            Thank you, but I always start qtcreator in terminal. It can be seen in floor.134

            sugon@EC:~$ source ~/.bashrc
            sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
            sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test

            There's no error message until I closed the software.

            JonBJ 1 Reply Last reply
            0
            • M mywings19

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

              Hi, perhaps you are launching Qt Creator by double clicking on it?
              If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

              Thank you, but I always start qtcreator in terminal. It can be seen in floor.134

              sugon@EC:~$ source ~/.bashrc
              sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
              sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test

              There's no error message until I closed the software.

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #141

              @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

              There's no error message until I closed the software.

              In that case when does the message you showed earlier:

              qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
              This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
              Available platform plugins are: linuxfb, minimal, offscreen, vnc.
              

              appear? Not until after you close Creator? Interesting.....

              M 1 Reply Last reply
              0
              • JonBJ JonB

                @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                There's no error message until I closed the software.

                In that case when does the message you showed earlier:

                qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                Available platform plugins are: linuxfb, minimal, offscreen, vnc.
                

                appear? Not until after you close Creator? Interesting.....

                M Offline
                M Offline
                mywings19
                wrote on last edited by mywings19
                #142

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

                @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                There's no error message until I closed the software.

                In that case when does the message you showed earlier:

                qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                Available platform plugins are: linuxfb, minimal, offscreen, vnc.
                

                appear? Not until after you close Creator? Interesting.....

                This 3 line message is showed when I build and run a test project.
                I mean after I set QT_DEBUG_PLUGINS to 1, There's no extra error message except this 3 line when I start qtcreator or run project in terminal.

                Now, I've uninstall the Qt and qtcreator,then installing by online installer.

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #143

                  Is that a custom Qt build ? Because from the looks of it, the plugin is indeed not there.

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

                  1 Reply Last reply
                  0
                  • B Offline
                    B Offline
                    BenyaminZojaji
                    wrote on last edited by
                    #144

                    In my case, I just upgrade PyQt5 to PyQt6 and that works.

                    1 Reply Last reply
                    0
                    • T trimixotun

                      It's looks slightly outdated, but maybe it someone helps:

                      1. Debian 10 x86-64.
                      2. LXDE
                      3. Fresh net install Qt 5.12.10

                      Qtcreator first launch problem: "qt.qpa.plugin: Could not load the Qt platform plugin "xcb"".

                      Nothing from above helps at all. Qtcreator needs libxcb-util.so.1, but system has only libxcb-util.so.

                      Simple solution:

                      sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                      All work, folks.

                      G Offline
                      G Offline
                      GEZawaTT
                      wrote on last edited by
                      #145

                      @trimixotun this worked!! Thank you so much!

                      1 Reply Last reply
                      0
                      • 3 Offline
                        3 Offline
                        3mad
                        wrote on last edited by
                        #146

                        In my case, I had the issue when installing ParaView, things fixed by installing the libxcb-xinput0 package:
                        sudo apt-get install libxcb-xinput0

                        Then, things work fine.

                        1 Reply Last reply
                        0
                        • R Offline
                          R Offline
                          roux.benoit
                          wrote on last edited by
                          #147

                          Hi,

                          I know this is an old post, but I have the same issue that comes up when I'm setting some path for the LD_Library_path.

                          for the context i'm creating a container that run an app with a gui using pyqt5, which works perfectly.

                          However, I also need to install matlab runtime and after I set up Matlab runtime environement path :

                          LD_LIBRARY_PATH=/opt/mscr/v912/runtime/glnxa64:/opt/mcr/v912/bin/glnxa64:/opt/mcr/v912/sys/os/glnxa64:/opt/mcr/v912/sys/opengl/lib/glnxa64

                          the gui stops working and I get the "qt.qpa.plugin ..." error message.

                          Any thoughts?
                          Thanks a lot

                          SGaistS 1 Reply Last reply
                          0
                          • R roux.benoit

                            Hi,

                            I know this is an old post, but I have the same issue that comes up when I'm setting some path for the LD_Library_path.

                            for the context i'm creating a container that run an app with a gui using pyqt5, which works perfectly.

                            However, I also need to install matlab runtime and after I set up Matlab runtime environement path :

                            LD_LIBRARY_PATH=/opt/mscr/v912/runtime/glnxa64:/opt/mcr/v912/bin/glnxa64:/opt/mcr/v912/sys/os/glnxa64:/opt/mcr/v912/sys/opengl/lib/glnxa64

                            the gui stops working and I get the "qt.qpa.plugin ..." error message.

                            Any thoughts?
                            Thanks a lot

                            SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #148

                            @roux-benoit hi,

                            Check whether there's Qt libraries in your matlab installation.

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

                            1 Reply Last reply
                            0
                            • P Offline
                              P Offline
                              phil-lipp
                              wrote on last edited by
                              #149

                              I hope someone on this forum can help me. I'm trying to use Howdy (https://github.com/boltgolt/howdy), but I get the error described by OP.
                              I only get the error when I use su -, however when I use plain su (without the -) it works. So I think i somehow messed up the install when I forgot to add the -... how can I fix this?

                              the error:

                              qt.qpa.xcb: could not connect to display 
                              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.
                              ``
                              JonBJ 1 Reply Last reply
                              0
                              • P phil-lipp

                                I hope someone on this forum can help me. I'm trying to use Howdy (https://github.com/boltgolt/howdy), but I get the error described by OP.
                                I only get the error when I use su -, however when I use plain su (without the -) it works. So I think i somehow messed up the install when I forgot to add the -... how can I fix this?

                                the error:

                                qt.qpa.xcb: could not connect to display 
                                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.
                                ``
                                JonBJ Offline
                                JonBJ Offline
                                JonB
                                wrote on last edited by
                                #150

                                @phil-lipp
                                https://forum.qt.io/post/763171 was just asked.

                                1 Reply Last reply
                                0
                                • M Offline
                                  M Offline
                                  MarsOnMart
                                  wrote on last edited by
                                  #151

                                  I had too problems with this file.
                                  It just depends from which shared file left you.
                                  first at all set in the console :

                                  export QT_DEBUG_PLUGINS=1

                                  This will show you in which part it fails, normally is in libqxcb.so,

                                  example:
                                  python main.py

                                  qt.core.plugin.factoryloader: checking directory path "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms" ...
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "wayland"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QWaylandIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimal.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimal.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "minimal"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QMinimalIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqeglfs.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqeglfs.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "eglfs"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QEglFSIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "wayland-egl"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QWaylandEglPlatformIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "offscreen"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QOffscreenIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "linuxfb"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QLinuxFbIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvnc.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvnc.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "vnc"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QVncIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "vkkhrdisplay"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QVkKhrDisplayIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "minimalegl"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QMinimalEglIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
                                  qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so"
                                  qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so, metadata=
                                  {
                                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                      "MetaData": {
                                          "Keys": [
                                              "xcb"
                                          ]
                                      },
                                      "archlevel": 1,
                                      "className": "QXcbIntegrationPlugin",
                                      "debug": false,
                                      "version": 394496
                                  }
                                  
                                  
                                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
                                  qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
                                  qt.core.library: "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" cannot load: Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so: (libxcb-cursor.so.0: cannot open shared object file: No such file or directory)
                                  qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so: (libxcb-cursor.so.0: 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: wayland, minimal, eglfs, wayland-egl, offscreen, linuxfb, vnc, vkkhrdisplay, minimalegl, xcb.
                                  
                                  zsh: IOT instruction  python main.py
                                  
                                  

                                  And this error occurs when some of the shared libraries are not found.
                                  In my case was the :
                                  "/usr/bin/platforms" ...
                                  qt.core.library: "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" cannot load: Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so:

                                  == =>(libxcb-cursor.so.0: cannot open shared object file: No such file or directory) <===

                                  qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so: (libxcb-cursor.so.0: cannot open shared object file: No such file or directory)"
                                  .
                                  This is the shared library that lefts , it could that does not be the only one , so for see better which shared libraries are and which not use the next command :

                                  ldd : /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so

                                  This must show you the next thing :

                                  ::
                                  ldd: ./:: No such file or directory
                                  /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so:
                                          linux-vdso.so.1 (0x00007fff8b5b6000)
                                          libQt6XcbQpa.so.6 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libQt6XcbQpa.so.6 (0x00007febd8bec000)
                                          libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007febd8bc3000)
                                          libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007febd8b7d000)
                                          libxcb-cursor.so.0 => not found
                                          libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007febd8b76000)
                                          libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007febd8b6e000)
                                          libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007febd8800000)
                                          libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007febd8b5d000)
                                          libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007febd8400000)
                                          libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007febd8b58000)
                                          libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007febd8b50000)
                                          libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007febd8b45000)
                                          libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007febd8b37000)
                                          libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007febd8b32000)
                                          libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007febd8b15000)
                                          libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007febd8aeb000)
                                          libQt6OpenGL.so.6 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libQt6OpenGL.so.6 (0x00007febd8a4a000)
                                          libQt6Gui.so.6 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007febd7a00000)
                                          libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007febd8779000)
                                          libQt6Core.so.6 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007febd7200000)
                                          libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007febd8a43000)
                                          libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007febd8637000)
                                          libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007febd8a3c000)
                                          libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007febd8a37000)
                                          libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007febd6e00000)
                                          libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007febd7921000)
                                          libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007febd8a17000)
                                          libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007febd701f000)
                                          libxcb-cursor.so.0 => not found
                                          libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007febd6cbd000)
                                          libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007febd8a10000)
                                          libxcb-util.so.1 => /lib/x86_64-linux-gnu/libxcb-util.so.1 (0x00007febd8a08000)
                                          libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007febd8a03000)
                                          libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007febd6a00000)
                                          libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007febd861f000)
                                          libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007febd78d6000)
                                          libQt6DBus.so.6 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007febd693b000)
                                          libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007febd83e1000)
                                          libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007febd6870000)
                                          libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007febd67b7000)
                                          libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007febd78a2000)
                                          libicui18n.so.56 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libicui18n.so.56 (0x00007febd6200000)
                                          libicuuc.so.56 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libicuuc.so.56 (0x00007febd5e00000)
                                          libicudata.so.56 => /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/../../lib/libicudata.so.56 (0x00007febd4400000)
                                          librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007febd8616000)
                                          /lib64/ld-linux-x86-64.so.2 (0x00007febd8ca7000)
                                          libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007febd6c23000)
                                          libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007febd83cb000)
                                          libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007febd678c000)
                                          libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007febd6736000)
                                          libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007febd6700000)
                                          libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x00007febd8607000)
                                          libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007febd7895000)
                                          libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007febd4331000)
                                          libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x00007febd66dd000)
                                          libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007febd6c17000)
                                          libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007febd41ea000)
                                          liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007febd66ae000)
                                          libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007febd412e000)
                                          liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007febd61da000)
                                          libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007febd4106000)
                                  

                                  As you can see the shared library which is not , appears like not found

                                      libxcb-cursor.so.0 => not found
                                  

                                  Just thus easier to fix it , is using :

                                  sudo apt install libxcb-cursor0

                                  In your case could be another like: libxcb-randr0

                                  1 Reply Last reply
                                  1
                                  • T twar

                                    Hello.
                                    After last qt5 update I'm getting this message:

                                    ~ $ qtcreator
                                    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.
                                    
                                    Aborted (core dumped)
                                    

                                    Here is strace log https://pastebin.com/1GfBFmUH

                                    Linux disto is manjaro which is based on archlinux. Any idea what is going on?

                                    Thank you and best regards.

                                    I Offline
                                    I Offline
                                    IuriiV
                                    wrote on last edited by
                                    #152

                                    @twar Hi, solved by sudo apt-get install libxcb*

                                    F O 2 Replies Last reply
                                    2
                                    • I IuriiV

                                      @twar Hi, solved by sudo apt-get install libxcb*

                                      F Offline
                                      F Offline
                                      fokhagyma
                                      wrote on last edited by
                                      #153

                                      @IuriiV Thank you, it solved for me too.

                                      1 Reply Last reply
                                      0
                                      • B Offline
                                        B Offline
                                        booter
                                        wrote on last edited by
                                        #154

                                        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: offscreen, wayland, vnc, minimalegl, xcb, wayland-egl, eglfs, linuxfb, vkkhrdisplay, minimal.

                                        sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

                                        sudo apt-get install libxkbcommon-x11-dev

                                        sudo apt-get install libxcb-xinerama0

                                        ++++++++++++++++++++++++++++++++++

                                        sudo apt-get install -qq libglu1-mesa-dev libx11-xcb-dev '^libxcb*'

                                        jsulmJ 1 Reply Last reply
                                        0
                                        • B booter

                                          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: offscreen, wayland, vnc, minimalegl, xcb, wayland-egl, eglfs, linuxfb, vkkhrdisplay, minimal.

                                          sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

                                          sudo apt-get install libxkbcommon-x11-dev

                                          sudo apt-get install libxcb-xinerama0

                                          ++++++++++++++++++++++++++++++++++

                                          sudo apt-get install -qq libglu1-mesa-dev libx11-xcb-dev '^libxcb*'

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #155

                                          @booter As in your other thread: do you have a question? Please ask a clear question if you have one!
                                          If you have same issue as in this thread then the solution should also be same: did you do that?

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

                                          S 1 Reply Last reply
                                          1

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