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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

    Install the package that provides "libxcb-util.so.1" on your system.

    S Offline
    S Offline
    steel357
    wrote on last edited by steel357
    #93

    @SGaist
    @jarvis Hi guys,
    I am also getting the same problem

    Got keys from plugin meta data ("webgl")
    QFactoryLoader::QFactoryLoader() looking at "/home/vineeth/.local/lib/python3.8/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
    Found metadata in lib /home/vineeth/.local/lib/python3.8/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so, metadata=
    {
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
    "Keys": [
    "xcb"
    ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331520
    }

    Got keys from plugin meta data ("xcb")
    QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
    loaded library "/home/vineeth/.local/lib/python3.8/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
    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.

    Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

    Aborted (core dumped)

    **did u found the solution??

    I am using Linux in windows(WSL) and tried it normal ubuntu also getting same error**

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #94

      "qt.qpa.xcb: could not connect to display"

      You should check the Windows documentation.

      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
      • M Offline
        M Offline
        MBat
        wrote on last edited by
        #95

        Good morning,

        I am having trouble running a python code (not written by me) that uses pyroot.
        My working system is Ubuntu 18.

        At the start of the script I get the following message

        cling::DynamicLibraryManager::loadLibrary(): /home/matteo/anaconda3/bin/../lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var
        Error in TInterpreter::TCling::AutoLoad: failure loading library libGX11TTF.so for TGX11TTF
        cling::DynamicLibraryManager::loadLibrary(): /home/matteo/anaconda3/bin/../lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var
        Info in TApplication::InitializeGraphics: no TTF support

        While, at the end, just before it crushes, (after export QT_DEBUG_PLUGINS=1) I get the following

        QFactoryLoader::QFactoryLoader() checking directory path "/home/matteo/anaconda3/plugins/platforms" ...
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqeglfs.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqeglfs.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "eglfs"
        ]
        },
        "archreq": 0,
        "className": "QEglFSIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("eglfs")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqminimal.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqminimal.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "minimal"
        ]
        },
        "archreq": 0,
        "className": "QMinimalIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("minimal")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqminimalegl.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqminimalegl.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "minimalegl"
        ]
        },
        "archreq": 0,
        "className": "QMinimalEglIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("minimalegl")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqoffscreen.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqoffscreen.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "offscreen"
        ]
        },
        "archreq": 0,
        "className": "QOffscreenIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("offscreen")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqvnc.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqvnc.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "vnc"
        ]
        },
        "archreq": 0,
        "className": "QVncIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("vnc")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqwebgl.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqwebgl.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "webgl"
        ]
        },
        "archreq": 0,
        "className": "QWebGLIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("webgl")
        QFactoryLoader::QFactoryLoader() looking at "/home/matteo/anaconda3/plugins/platforms/libqxcb.so"
        Found metadata in lib /home/matteo/anaconda3/plugins/platforms/libqxcb.so, metadata=
        {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
        "Keys": [
        "xcb"
        ]
        },
        "archreq": 0,
        "className": "QXcbIntegrationPlugin",
        "debug": false,
        "version": 330752
        }

        Got keys from plugin meta data ("xcb")
        QFactoryLoader::QFactoryLoader() checking directory path "/home/matteo/anaconda3/bin/platforms" ...
        Cannot load library /home/matteo/anaconda3/plugins/platforms/libqxcb.so: (/home/matteo/anaconda3/plugins/platforms/../../lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var)
        QLibraryPrivate::loadPlugin failed on "/home/matteo/anaconda3/plugins/platforms/libqxcb.so" : "Cannot load library /home/matteo/anaconda3/plugins/platforms/libqxcb.so: (/home/matteo/anaconda3/plugins/platforms/../../lib/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var)"
        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, minimal, minimalegl, offscreen, vnc, webgl, xcb.

        The output of the command ls -l /usr/lib/x86_64-linux-gnu/libQt5Xcb* is

        -rw-r--r-- 1 root root 1602 feb 7 2020 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.prl
        lrwxrwxrwx 1 root root 21 feb 7 2020 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so -> libQt5XcbQpa.so.5.9.5
        lrwxrwxrwx 1 root root 21 feb 7 2020 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 -> libQt5XcbQpa.so.5.9.5
        lrwxrwxrwx 1 root root 21 feb 7 2020 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.9 -> libQt5XcbQpa.so.5.9.5
        -rw-r--r-- 1 root root 1070840 feb 7 2020 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.9.5

        So, the point is that I do not have a deep knowledge of Ubuntu system in genreal, and I do not know if the problem is only with QT plugins or is elsewhere. The only thing I know is that the code itself is working fine in other machines, so the problem should not rely there.

        Thanks if you can help me, let me know if you need any other information.

        Thanks!

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #96

          Hi and welcome to devnet,

          Your anaconda installation looks unusual, how did you do it ?

          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
          • M Offline
            M Offline
            MBat
            wrote on last edited by
            #97

            Thanks for the welcome!

            I actually don't remember anything particular from the installation of Anaconda. But it has been 3 years ago, so I might have forgotten.
            Why do you say that it looks unusual?

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #98

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

              anaconda3/plugins/platforms/libqxcb.so

              Usually conda environments are not located at that level. That's what I find suspicious. But I have essentially used miniconda rather than the full Anaconda.

              Your main issue is that there's something wrong with your libfontconfig library.

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

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              • M Matriarch

                @Lengendary This is working solution for me, thank you

                sudo apt-get install libxcb-xinerama0

                V Offline
                V Offline
                Violet Giraffe
                wrote on last edited by Violet Giraffe
                #99

                @Matriarch, thank you,

                sudo apt-get install libxcb-xinerama0
                

                worked for me on Ubuntu 20.04. Shame one has to scroll so deep down into the discussion before finding the answer.

                Also, I recently spent a lot of time getting a Qt application to run in a Github Actions VM - I was battling the xcb errors. Here's the complete list of things that needed to be installed:

                sudo apt-get install -qq libglu1-mesa-dev libx11-xcb-dev '^libxcb*'
                
                ali-aydinA 1 Reply Last reply
                1
                • S Offline
                  S Offline
                  sonamde
                  wrote on last edited by
                  #100

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

                  libxcb-xinerama0

                  I am also facing the same issue :
                  Got keys from plugin meta data ("xcb")
                  QFactoryLoader::QFactoryLoader() checking directory path "/qfs/people/deso666/.conda/envs/particle/bin/platforms" ...
                  Cannot load library /qfs/people/deso666/.conda/envs/particle/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so: (/share/apps/python/anaconda3.2019.3/lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform, version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)
                  QLibraryPrivate::loadPlugin failed on "/qfs/people/deso666/.conda/envs/particle/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /qfs/people/deso666/.conda/envs/particle/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/libqxcb.so: (/share/apps/python/anaconda3.2019.3/lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform, version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)"
                  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, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

                  sh: line 1: 26241 Aborted (core dumped) python gui_annotation.py

                  Then I ran:

                  user$ cd /qfs/people/deso666/.conda/envs/particle/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/
                  user$ ldd libqxcb.so
                  ./libqxcb.so: /share/apps/python/anaconda3.2019.3/lib/libQt5Core.so.5: version `Qt_5.13' not found (required by ./libqxcb.so)
                  linux-vdso.so.1 => (0x00007ffd83f66000)
                  libQt5XcbQpa.so.5 => /share/apps/python/anaconda3.2019.3/lib/libQt5XcbQpa.so.5 (0x00007fcf99cc3000)
                  libfontconfig.so.1 => /share/apps/python/anaconda3.2019.3/lib/libfontconfig.so.1 (0x00007fcf99a7e000)
                  libfreetype.so.6 => /share/apps/python/anaconda3.2019.3/lib/libfreetype.so.6 (0x00007fcf999d2000)
                  libz.so.1 => /share/apps/python/anaconda3.2019.3/lib/libz.so.1 (0x00007fcf999b2000)
                  libQt5Gui.so.5 => /share/apps/python/anaconda3.2019.3/lib/libQt5Gui.so.5 (0x00007fcf995e5000)
                  libQt5DBus.so.5 => /share/apps/python/anaconda3.2019.3/lib/libQt5DBus.so.5 (0x00007fcf99585000)
                  libQt5Core.so.5 => /share/apps/python/anaconda3.2019.3/lib/libQt5Core.so.5 (0x00007fcf9916e000)
                  libGL.so.1 => /usr/lib64/libGL.so.1 (0x00007fcf98efb000)
                  libpthread.so.0 => /usr/lib64/libpthread.so.0 (0x00007fcf98cdf000)
                  libX11-xcb.so.1 => /share/apps/python/anaconda3.2019.3/lib/libX11-xcb.so.1 (0x00007fcf98cda000)
                  libxcb.so.1 => /share/apps/python/anaconda3.2019.3/lib/libxcb.so.1 (0x00007fcf98ab0000)
                  libXrender.so.1 => /usr/lib64/libXrender.so.1 (0x00007fcf988a5000)
                  libXext.so.6 => /share/apps/python/anaconda3.2019.3/lib/libXext.so.6 (0x00007fcf98890000)
                  libX11.so.6 => /share/apps/python/anaconda3.2019.3/lib/libX11.so.6 (0x00007fcf9874c000)
                  libm.so.6 => /usr/lib64/libm.so.6 (0x00007fcf9844a000)
                  libxkbcommon-x11.so.0 => /usr/lib64/libxkbcommon-x11.so.0 (0x00007fcf98242000)
                  libxkbcommon.so.0 => /usr/lib64/libxkbcommon.so.0 (0x00007fcf98001000)
                  libdl.so.2 => /usr/lib64/libdl.so.2 (0x00007fcf97dfd000)
                  libstdc++.so.6 => /share/apps/python/anaconda3.2019.3/lib/libstdc++.so.6 (0x00007fcf97cbc000)
                  libgcc_s.so.1 => /share/apps/python/anaconda3.2019.3/lib/libgcc_s.so.1 (0x00007fcf97ca7000)
                  libc.so.6 => /usr/lib64/libc.so.6 (0x00007fcf978e4000)
                  libgthread-2.0.so.0 => /share/apps/python/anaconda3.2019.3/lib/./libgthread-2.0.so.0 (0x00007fcf978df000)
                  librt.so.1 => /usr/lib64/librt.so.1 (0x00007fcf976d6000)
                  libglib-2.0.so.0 => /share/apps/python/anaconda3.2019.3/lib/./libglib-2.0.so.0 (0x00007fcf975b9000)
                  libXi.so.6 => /usr/lib64/libXi.so.6 (0x00007fcf973a9000)
                  libxml2.so.2 => /share/apps/python/anaconda3.2019.3/lib/./libxml2.so.2 (0x00007fcf9723e000)
                  libuuid.so.1 => /share/apps/python/anaconda3.2019.3/lib/./libuuid.so.1 (0x00007fcf9703a000)
                  libpng16.so.16 => /share/apps/python/anaconda3.2019.3/lib/./libpng16.so.16 (0x00007fcf97000000)
                  libdbus-1.so.3 => /share/apps/python/anaconda3.2019.3/lib/./libdbus-1.so.3 (0x00007fcf96fac000)
                  libicui18n.so.58 => /share/apps/python/anaconda3.2019.3/lib/./libicui18n.so.58 (0x00007fcf96b37000)
                  libicuuc.so.58 => /share/apps/python/anaconda3.2019.3/lib/./libicuuc.so.58 (0x00007fcf96788000)
                  libicudata.so.58 => /share/apps/python/anaconda3.2019.3/lib/./libicudata.so.58 (0x00007fcf94c88000)
                  /lib64/ld-linux-x86-64.so.2 (0x0000565509dbb000)
                  libexpat.so.1 => /share/apps/python/anaconda3.2019.3/lib/libexpat.so.1 (0x00007fcf94c54000)
                  libxcb-dri3.so.0 => /share/apps/python/anaconda3.2019.3/lib/libxcb-dri3.so.0 (0x00007fcf94a4e000)
                  libxcb-present.so.0 => /share/apps/python/anaconda3.2019.3/lib/libxcb-present.so.0 (0x00007fcf9484b000)
                  libxcb-sync.so.1 => /share/apps/python/anaconda3.2019.3/lib/libxcb-sync.so.1 (0x00007fcf94644000)
                  libxshmfence.so.1 => /usr/lib64/libxshmfence.so.1 (0x00007fcf94440000)
                  libglapi.so.0 => /usr/lib64/libglapi.so.0 (0x00007fcf94211000)
                  libselinux.so.1 => /usr/lib64/libselinux.so.1 (0x00007fcf93fea000)
                  libXdamage.so.1 => /usr/lib64/libXdamage.so.1 (0x00007fcf93de6000)
                  libXfixes.so.3 => /usr/lib64/libXfixes.so.3 (0x00007fcf93be0000)
                  libxcb-glx.so.0 => /share/apps/python/anaconda3.2019.3/lib/libxcb-glx.so.0 (0x00007fcf939c4000)
                  libxcb-dri2.so.0 => /share/apps/python/anaconda3.2019.3/lib/libxcb-dri2.so.0 (0x00007fcf937be000)
                  libXxf86vm.so.1 => /usr/lib64/libXxf86vm.so.1 (0x00007fcf935b8000)
                  libdrm.so.2 => /usr/lib64/libdrm.so.2 (0x00007fcf933a9000)
                  libXau.so.6 => /usr/lib64/libXau.so.6 (0x00007fcf931a4000)
                  libxcb-xkb.so.1 => /usr/lib64/libxcb-xkb.so.1 (0x00007fcf92f88000)
                  libpcre.so.1 => /share/apps/python/anaconda3.2019.3/lib/././libpcre.so.1 (0x00007fcf92f3f000)
                  liblzma.so.5 => /share/apps/python/anaconda3.2019.3/lib/././liblzma.so.5 (0x00007fcf92d19000)

                  please help me.

                  1 Reply Last reply
                  0
                  • I Offline
                    I Offline
                    IagoGV
                    wrote on last edited by IagoGV
                    #101

                    For those who could face the same issue: I also got

                    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, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.      
                    

                    when trying to open last release of Dooble web browser (2021.07.05) on debian 10. Checking through export QT_DEBUG_PLUGINS=1 I found that

                    Cannot load library /opt/dooble/plugins/platforms/libqxcb.so: (libxcb-util.so.1: cannot open shared object file: No such file or directory) 
                    QLibraryPrivate::loadPlugin failed on "/opt/dooble/plugins/platforms/libqxcb.so" :
                    "Cannot load library /opt/dooble/plugins/platforms/libqxcb.so: (libxcb-util.so.1: 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, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.      
                    

                    After many tries of reinstalling libraries as suggested, finally I found the issue: I had installed libxcb-util0, but I needed libxcb-util1, which is only in the repository of Testing version of Debian 10. Installing it solved my issue.

                    Thanks for the suggestion of using export QT_DEBUG_PLUGINS=1.

                    1 Reply Last reply
                    2
                    • SGaistS SGaist

                      Hi,

                      You should run your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see what might go wrong when the plugin is loaded.

                      S Offline
                      S Offline
                      Salihu
                      wrote on last edited by
                      #102

                      @SGaist Hey, i use a hp chromebook, with a linux development environment. I downloaded the Qt online installer and installed Qt succesfully but when i tried to run it i got this error:

                      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.

                      can you please help.

                      SGaistS 1 Reply Last reply
                      0
                      • S Salihu

                        @SGaist Hey, i use a hp chromebook, with a linux development environment. I downloaded the Qt online installer and installed Qt succesfully but when i tried to run it i got this error:

                        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.

                        can you please help.

                        SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #103

                        @Salihu hi and welcome to devnet,

                        Please read the thread, there are already several suggestions made to both find the reason and fix the issue.

                        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
                        1
                        • A Offline
                          A Offline
                          AlekHorak
                          wrote on last edited by AlekHorak
                          #104

                          I have same problem on redhat 8
                          after updating to qt creator 5
                          and one of solution that i did is to insted of running "/opt/Qt/Tools/QtCreator/bin/qtcreator"
                          I run "/opt/Qt/Tools/QtCreator/bin/qtcreator.sh"

                          for icon to work:
                          cd /usr/local/share/applications
                          sudo vim org.qt-project.qtcreator.desktop

                          change this: Exec="/opt/Qt/Tools/QtCreator/bin/qtcreator" %F
                          to this: Exec="/opt/Qt/Tools/QtCreator/bin/qtcreator.sh" %F

                          1 Reply Last reply
                          0
                          • T Offline
                            T Offline
                            TheOldBloke
                            wrote on last edited by
                            #105

                            I have been trying to automatically LiveStream OBS-Studio, for sometime now, I was getting the error message reported here.
                            My setup is Ubuntu 21.0.4 OBS-Studio 27.01. I have a scrip that runs OBS with all the correct parameters to choose the correct video depending on the day of week. This script works perfectly. But it would not run from crontab.
                            The bulk of this post did not seem like it was solving the real problem and did not solve mine.

                            The thing is my script did work when I ran it from the command line from within my "GUI" session. This indicates to me that I had all the correct things in place to run my script.

                            After some thought I realised .....
                            crontab runs on the console, if you want to think of it as an old tty terminal not a GUI session.

                            So I determined what my $DISPLAY is by typing "echo $DISPLAY, in my case this returned 0 (zero).

                            Now I know my DISPLAY I putting the DISPLAY=0 in the users crontab, before calling my script and this worked.

                            As above, I determined my DISPLAY number by: Typing echo $DISPLAY and pressing ENTER. This gave me 0.

                            My crontab now has: 55 20 * * * DISPLAY=:0 /home/pats/Documents/LiveStreamFiles/scripts/myscript.sh 2>&1 &

                            Thanks again and I hope this helps others...

                            1 Reply Last reply
                            0
                            • N Offline
                              N Offline
                              Nikolay_spb
                              wrote on last edited by
                              #106

                              Nikolay_spb about an hour ago

                              Help my please.
                              I have error and cat't it fixed two day.
                              I done two commands

                              export QT_DEBUG_PLUGINS=1
                              qtcreator

                              and get code

                              QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" ...
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "eglfs"
                              ]
                              },
                              "archreq": 0,
                              "className": "QEglFSIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("eglfs")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "linuxfb"
                              ]
                              },
                              "archreq": 0,
                              "className": "QLinuxFbIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("linuxfb")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "minimal"
                              ]
                              },
                              "archreq": 0,
                              "className": "QMinimalIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("minimal")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "minimalegl"
                              ]
                              },
                              "archreq": 0,
                              "className": "QMinimalEglIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("minimalegl")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "offscreen"
                              ]
                              },
                              "archreq": 0,
                              "className": "QOffscreenIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("offscreen")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "vnc"
                              ]
                              },
                              "archreq": 0,
                              "className": "QVncIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("vnc")
                              QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                              Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so, metadata=
                              {
                              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                              "MetaData": {
                              "Keys": [
                              "xcb"
                              ]
                              },
                              "archreq": 0,
                              "className": "QXcbIntegrationPlugin",
                              "debug": false,
                              "version": 330752
                              }

                              Got keys from plugin meta data ("xcb")
                              QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
                              loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                              qt.qpa.xcb: could not connect to display :1.0
                              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.

                              Where i have error?

                              QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...

                              
                              loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                              JonBJ 1 Reply Last reply
                              0
                              • N Nikolay_spb

                                Nikolay_spb about an hour ago

                                Help my please.
                                I have error and cat't it fixed two day.
                                I done two commands

                                export QT_DEBUG_PLUGINS=1
                                qtcreator

                                and get code

                                QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" ...
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "eglfs"
                                ]
                                },
                                "archreq": 0,
                                "className": "QEglFSIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("eglfs")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "linuxfb"
                                ]
                                },
                                "archreq": 0,
                                "className": "QLinuxFbIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("linuxfb")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "minimal"
                                ]
                                },
                                "archreq": 0,
                                "className": "QMinimalIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("minimal")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "minimalegl"
                                ]
                                },
                                "archreq": 0,
                                "className": "QMinimalEglIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("minimalegl")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "offscreen"
                                ]
                                },
                                "archreq": 0,
                                "className": "QOffscreenIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("offscreen")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "vnc"
                                ]
                                },
                                "archreq": 0,
                                "className": "QVncIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("vnc")
                                QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                                Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so, metadata=
                                {
                                "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                "MetaData": {
                                "Keys": [
                                "xcb"
                                ]
                                },
                                "archreq": 0,
                                "className": "QXcbIntegrationPlugin",
                                "debug": false,
                                "version": 330752
                                }

                                Got keys from plugin meta data ("xcb")
                                QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
                                loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                                qt.qpa.xcb: could not connect to display :1.0
                                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.

                                Where i have error?

                                QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...

                                
                                loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
                                JonBJ Online
                                JonBJ Online
                                JonB
                                wrote on last edited by
                                #107

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

                                qt.qpa.xcb: could not connect to display :1.0

                                Same question and answer as in your thread https://forum.qt.io/topic/130978/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in. Not an xcb library loading problem, rather however your X display is set up/connecting.

                                Please pick one or other thread to discuss. Suggest the other one now that you have started it.

                                1 Reply Last reply
                                1
                                • gde23G Offline
                                  gde23G Offline
                                  gde23
                                  wrote on last edited by
                                  #108

                                  I, think I just had the same problem (on Debian 10). Did a sys-update -> QtCreator does not start anymore.
                                  How I got QtCreator to start again is by adding a soft link to libxcb-util since it seems that the platformplugi is trying to load the wrong version?

                                  sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1
                                  

                                  That might not be a perfect solution but now I can use it again at least.

                                  1 Reply Last reply
                                  0
                                  • SGaistS SGaist

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

                                    QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimalegl.so"
                                    Got keys from plugin meta data ("minimalegl")
                                    QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqoffscreen.so"
                                    Got

                                    Hi,

                                    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to get more information.

                                    ali-aydinA Offline
                                    ali-aydinA Offline
                                    ali-aydin
                                    wrote on last edited by
                                    #109

                                    hi,@SGaist
                                    how to start application with the QT_DEBUG_PLUGINS??

                                    1 Reply Last reply
                                    0
                                    • V Violet Giraffe

                                      @Matriarch, thank you,

                                      sudo apt-get install libxcb-xinerama0
                                      

                                      worked for me on Ubuntu 20.04. Shame one has to scroll so deep down into the discussion before finding the answer.

                                      Also, I recently spent a lot of time getting a Qt application to run in a Github Actions VM - I was battling the xcb errors. Here's the complete list of things that needed to be installed:

                                      sudo apt-get install -qq libglu1-mesa-dev libx11-xcb-dev '^libxcb*'
                                      
                                      ali-aydinA Offline
                                      ali-aydinA Offline
                                      ali-aydin
                                      wrote on last edited by
                                      #110

                                      hello @Violet-Giraffe
                                      it worked for me
                                      thank you

                                      1 Reply Last reply
                                      0
                                      • S Srinivas Reddy

                                        I am using Qt-5.15.0, got the same problem.
                                        More details are:
                                        QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

                                        Solved by installing the dependent package.
                                        Command to install: sudo apt-get install libxcb-xinerama0

                                        A Offline
                                        A Offline
                                        Alireza Kazemipour
                                        wrote on last edited by
                                        #111

                                        @Srinivas-Reddy Yes, that's the solution. ❤️

                                        1 Reply Last reply
                                        0
                                        • S Srinivas Reddy

                                          I am using Qt-5.15.0, got the same problem.
                                          More details are:
                                          QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

                                          Solved by installing the dependent package.
                                          Command to install: sudo apt-get install libxcb-xinerama0

                                          L Offline
                                          L Offline
                                          LTossit
                                          wrote on last edited by LTossit
                                          #112

                                          Thanks, now it works!

                                          1 Reply Last reply
                                          0

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