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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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  • 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 Online
        JonBJ Online
        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
                  • jsulmJ jsulm

                    @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?

                    S Offline
                    S Offline
                    Spiv
                    wrote on last edited by
                    #156

                    @jsulm
                    Since I am getting the same error, I read the whole thread from the very beginning and tried all solutions but I still cannot load something....
                    I have Lenovo Ideapad Flex5 running Kubuntu.
                    I upgraded Kubuntu 20.04 first to 23.04,then to 23.10.
                    Then something happened ...
                    Now when I start the laptop I get to the login, put my password, the desktop and wallpaper show for 1 second, then I get a black screen.
                    Using Ctrl+Alt+F4 I can get to a terminal, but a cannot copy/paste anything into a browser since I cannot load a browser because I get an error very similar to the original post.
                    I am writing this through my phone.
                    I can take pictures of the terminal and the result of commands, but cannot paste anything....
                    Can you help me please regain my desktop display?

                    BTW, how do I attach pictures here?

                    SGaistS 1 Reply Last reply
                    0
                    • S Spiv

                      @jsulm
                      Since I am getting the same error, I read the whole thread from the very beginning and tried all solutions but I still cannot load something....
                      I have Lenovo Ideapad Flex5 running Kubuntu.
                      I upgraded Kubuntu 20.04 first to 23.04,then to 23.10.
                      Then something happened ...
                      Now when I start the laptop I get to the login, put my password, the desktop and wallpaper show for 1 second, then I get a black screen.
                      Using Ctrl+Alt+F4 I can get to a terminal, but a cannot copy/paste anything into a browser since I cannot load a browser because I get an error very similar to the original post.
                      I am writing this through my phone.
                      I can take pictures of the terminal and the result of commands, but cannot paste anything....
                      Can you help me please regain my desktop display?

                      BTW, how do I attach pictures here?

                      SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #157

                      @Spiv hi and welcome to devnet,

                      Did you try to use the Wayland session rather than the Xorg ? You should be able to select that from the login screen.

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

                      S 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        @Spiv hi and welcome to devnet,

                        Did you try to use the Wayland session rather than the Xorg ? You should be able to select that from the login screen.

                        S Offline
                        S Offline
                        Spiv
                        wrote on last edited by
                        #158

                        @SGaist
                        Hi, thank you for responding so quickly.
                        I don't know what you are suggesting, sorry....
                        How do I select a different (Wayland) session?

                        S 1 Reply Last reply
                        0
                        • S Spiv

                          @SGaist
                          Hi, thank you for responding so quickly.
                          I don't know what you are suggesting, sorry....
                          How do I select a different (Wayland) session?

                          S Offline
                          S Offline
                          Spiv
                          wrote on last edited by Spiv
                          #159

                          I did figure that out...
                          With 'Plasma Wayland' I did not even see a flash of my desktop, just a dark screen.
                          'Plasma X11', desktop flash for a second, then black screen.
                          'Ubuntu' gave me a blue screen on which I can invoke all applications, including Firefox.
                          'Ubuntu Wayland' and 'Ubuntu on Xorg' also give me a working environment.
                          However, I cannot go into 'settings' for some reason.

                          SGaistS 1 Reply Last reply
                          0
                          • S Spiv

                            I did figure that out...
                            With 'Plasma Wayland' I did not even see a flash of my desktop, just a dark screen.
                            'Plasma X11', desktop flash for a second, then black screen.
                            'Ubuntu' gave me a blue screen on which I can invoke all applications, including Firefox.
                            'Ubuntu Wayland' and 'Ubuntu on Xorg' also give me a working environment.
                            However, I cannot go into 'settings' for some reason.

                            SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #160

                            Did you check the logs of your system to see if something else is wrong ?

                            In any case, I would also check with the Kubuntu folks.

                            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
                            • I IuriiV

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

                              O Offline
                              O Offline
                              Octopic
                              wrote on last edited by
                              #161

                              @IuriiV mee too. If someone could add it in first comment it would be really helpful ;-)

                              1 Reply Last reply
                              0
                              • M Offline
                                M Offline
                                mrt06
                                wrote on last edited by
                                #162

                                Hi, I am trying to run paraview for OpenFOAM but I have that error:

                                
mrt06@DESKTOP-JQP308P:~$ paraview
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, xcb.

Aborted

                                Then I tried with QT_DEBUG_PLUGINS=1:

                                mrt06@DESKTOP-JQP308P:~$ export QT_DEBUG_PLUGINS=1
mrt06@DESKTOP-JQP308P:~$ paraview
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": 331520
}


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": 331520
}


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": 331520
}


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": 331520
}


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": 331520
}


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": 331520
}


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": 331520
}


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
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

                                After that I wrote that line without any conscious and get that:

                                mrt06@DESKTOP-JQP308P:~$ ldd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
        linux-vdso.so.1 (0x00007fff2fbd8000)
        libQt5XcbQpa.so.5 => /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 (0x00007f10aff1b000)
        libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007f10af83d000)
        libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007f10af2de000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f10af0b2000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f10aee88000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f10aee3e000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f10aed76000)
        libQt5DBus.so.5 => /lib/x86_64-linux-gnu/libQt5DBus.so.5 (0x00007f10aece2000)
        libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f10aecdd000)
        libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f10aecd6000)
        libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f10aecce000)
        libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f10aecc9000)
        libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f10aecc4000)
        libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f10aecb1000)
        libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f10aecaa000)
        libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f10aec9b000)
        libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f10aec94000)
        libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f10aec8a000)
        libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f10aec80000)
        libxcb-xinerama.so.0 => /lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007f10aec7b000)
        libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f10aec5d000)
        libxcb-xinput.so.0 => /lib/x86_64-linux-gnu/libxcb-xinput.so.0 (0x00007f10aec39000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f10aec0d000)
        libXrender.so.1 => /lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f10aec00000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f10aeac0000)
        libSM.so.6 => /lib/x86_64-linux-gnu/libSM.so.6 (0x00007f10aeab5000)
        libICE.so.6 => /lib/x86_64-linux-gnu/libICE.so.6 (0x00007f10aea98000)
        libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f10aea8d000)
        libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f10aea44000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f10ae90a000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f10ae823000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f10ae803000)
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f10ae77c000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f10ae73f000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f10ae723000)
        libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007f10ae654000)
        libmd4c.so.0 => /lib/x86_64-linux-gnu/libmd4c.so.0 (0x00007f10ae642000)
        libdouble-conversion.so.3 => /lib/x86_64-linux-gnu/libdouble-conversion.so.3 (0x00007f10ae62d000)
        libicui18n.so.70 => /lib/x86_64-linux-gnu/libicui18n.so.70 (0x00007f10ae2fe000)
        libicuuc.so.70 => /lib/x86_64-linux-gnu/libicuuc.so.70 (0x00007f10ae101000)
        libpcre2-16.so.0 => /lib/x86_64-linux-gnu/libpcre2-16.so.0 (0x00007f10ae077000)
        libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007f10adfa8000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f10b00b4000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f10adf77000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f10adf6e000)
        libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x00007f10adf5e000)
        libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f10adf10000)
        libxcb-util.so.1 => /lib/x86_64-linux-gnu/libxcb-util.so.1 (0x00007f10adf07000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f10adf01000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f10adef9000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f10adedf000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f10ade69000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f10addb1000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f10add7d000)
        libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007f10add56000)
        libicudata.so.70 => /lib/x86_64-linux-gnu/libicudata.so.70 (0x00007f10ac136000)
        libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x00007f10ac113000)
        libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f10ac04c000)
        libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007f10ac03f000)
        liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f10ac014000)
        liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f10abff2000)
        libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f10abfe7000)
        libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f10abea9000)
        libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f10abe83000)

                                I am using wsl2 Ubuntu and I have no idea with Linux. Can you please tell me what should I do? I tried to install libraries but nothing is changed

                                1 Reply Last reply
                                0
                                • hskoglundH Online
                                  hskoglundH Online
                                  hskoglund
                                  wrote on last edited by
                                  #163

                                  Hi, maybe your wsl2 needs an X Server to be running, or perhaps you have no vGPU driver installed. Or your Windows 10 is too old so you need to upgrade to Windows 11. More here

                                  M 2 Replies Last reply
                                  2
                                  • hskoglundH hskoglund

                                    Hi, maybe your wsl2 needs an X Server to be running, or perhaps you have no vGPU driver installed. Or your Windows 10 is too old so you need to upgrade to Windows 11. More here

                                    M Offline
                                    M Offline
                                    mrt06
                                    wrote on last edited by mrt06
                                    #164
                                    This post is deleted!
                                    1 Reply Last reply
                                    0
                                    • T twar

                                      The same as before:

                                      ~ $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
/usr/lib/qt/plugins/platforms/libqxcb.so: error while loading shared libraries: /usr/lib/libxcb-xinerama.so.0: invalid ELF header

                                      but after that

                                      ~ $ sudo pacman -S libxcb
[sudo] password for tomasz: 
warning: libxcb-1.13-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...

Packages (1) libxcb-1.13-1

Total Download Size:   0.99 MiB
Total Installed Size:  3.96 MiB
Net Upgrade Size:      0.00 MiB

:: Proceed with installation? [Y/n] Y
:: Retrieving packages...
 libxcb-1.13-1-x86_64          1017.5 KiB   242K/s 00:04 [##############################] 100%
(1/1) checking keys in keyring                           [##############################] 100%
(1/1) checking package integrity                         [##############################] 100%
(1/1) loading package files                              [##############################] 100%
(1/1) checking for file conflicts                        [##############################] 100%
(1/1) checking available disk space                      [##############################] 100%
:: Processing package changes...
(1/1) reinstalling libxcb                                [##############################] 100%
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...
~ $ pacman -Qo /usr/lib/libxcb-xinerama.so.0
/usr/lib/libxcb-xinerama.so.0 is owned by libxcb 1.13-1
~ $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
	linux-vdso.so.1 (0x00007ffc93f56000)
	libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007f730ea63000)
	libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f730e2d5000)
	libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f730dbd4000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f730d84b000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007f730d48f000)
	libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007f730d24c000)
	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f730cf83000)
	libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007f730ccf3000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f730cad5000)
	libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007f730c8d3000)
	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f730c594000)
	libXi.so.6 => /usr/lib/libXi.so.6 (0x00007f730c383000)
	libSM.so.6 => /usr/lib/libSM.so.6 (0x00007f730c17b000)
	libICE.so.6 => /usr/lib/libICE.so.6 (0x00007f730bf5f000)
	libXrender.so.1 => /usr/lib/libXrender.so.1 (0x00007f730bd54000)
	libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007f730bb37000)
	libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007f730b933000)
	libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007f730b725000)
	libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007f730b51e000)
	libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007f730b316000)
	libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007f730b113000)
	libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007f730af03000)
	libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007f730acfe000)
	libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007f730aafa000)
	libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007f730a8f7000)
	libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007f730a6f2000)
	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f730a4c9000)
	libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007f730a2c5000)
	libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007f730a086000)
	libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007f7309e7f000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007f7309aea000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f73098d2000)
	libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f7309647000)
	libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f7309411000)
	libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007f7309165000)
	libz.so.1 => /usr/lib/libz.so.1 (0x00007f7308f4e000)
	libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007f7308cc4000)
	libicui18n.so.61 => /usr/lib/libicui18n.so.61 (0x00007f7308819000)
	libicuuc.so.61 => /usr/lib/libicuuc.so.61 (0x00007f730845f000)
	libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007f73081e8000)
	libdouble-conversion.so.1 => /usr/lib/libdouble-conversion.so.1 (0x00007f7307fd8000)
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f7307dd4000)
	libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f7307abd000)
	/usr/lib64/ld-linux-x86-64.so.2 (0x00007f730efdd000)
	libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007f730788b000)
	libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007f7307684000)
	libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f7307474000)
	libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007f7307223000)
	libXext.so.6 => /usr/lib/libXext.so.6 (0x00007f7307011000)
	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f7306e0d000)
	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f7306c07000)
	libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007f7306a01000)
	libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f73067d0000)
	libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f730651a000)
	libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007f73062ee000)
	librt.so.1 => /usr/lib/librt.so.1 (0x00007f73060e6000)
	liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f7305ec0000)
	liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007f7305ca3000)
	libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007f7305987000)
	libicudata.so.61 => /usr/lib/libicudata.so.61 (0x00007f7303de2000)
	libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007f7303b70000)
	libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007f7303950000)
~ $ qtcreator
QApplication: invalid style override passed, ignoring it.

                                      so it seems that reinstalling libxcb fixed the issue. So thank you very much guys.
                                      I own you really big beer :-)

                                      @SGaist
                                      there is no such thing on manjaro or archlinux which manjaro is baseed on

                                      D Offline
                                      D Offline
                                      Drexel
                                      wrote on last edited by
                                      #165

                                      Had the same problem today. Activated QT_DEBUG_PLUGINS:

                                      (.venv) raspifm@raspifm:~/Documents/src/raspiFM $  cd /home/raspifm/Documents/src/raspiFM ; /usr/bin/env /home/raspifm/Documents/src/raspiFM/.venv/bin/python /home/raspifm/.vscode/extensions/ms-python.python-2023.20.0/pythonFiles/lib/python/debugpy/adapter/../../debugpy/launcher 37365 -- -m src.touchui 
qt.core.plugin.factoryloader: checking directory path "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms" ...
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvnc.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QVkKhrDisplayIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqeglfs.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
qt.core.plugin.factoryloader: looking at "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimal.so"
qt.core.plugin.loader: Found metadata in lib /home/raspifm/Documents/src/raspiFM/.venv/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": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 394752
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
qt.core.library: "/home/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" cannot load: Cannot load library /home/raspifm/Documents/src/raspiFM/.venv/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/raspifm/Documents/src/raspiFM/.venv/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/raspifm/Documents/src/raspiFM/.venv/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-egl, offscreen, linuxfb, xcb, vnc, minimalegl, vkkhrdisplay, wayland, eglfs, minimal.

                                      Installed package libxcb-cursor0 and now it works....

                                      1 Reply Last reply
                                      0
                                      • hskoglundH hskoglund

                                        Hi, maybe your wsl2 needs an X Server to be running, or perhaps you have no vGPU driver installed. Or your Windows 10 is too old so you need to upgrade to Windows 11. More here

                                        M Offline
                                        M Offline
                                        mrt06
                                        wrote on last edited by
                                        #166

                                        @hskoglund I updated my wsl and problem solved. thank you.

                                        T 1 Reply Last reply
                                        0
                                        • J Offline
                                          J Offline
                                          jonathan.taylor
                                          wrote on last edited by
                                          #167

                                          I just spun up a fresh Ubuntu 23.10 box with default options selected. From there, I tried installing Qt first thing.

                                          I couldn't launch the Qt Maintenance tool / installer until I did this:

                                          sudo apt-get install -y build-essential libx11-xcb-dev libglu1-mesa-dev libxcb-xinerama0

                                          After installation, I still couldn't launch Creator, running into error "qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found."

                                          So, I found this web page (which appears to be for the benefit of Stamford students working on something or another I didn't bother trying to figure out) on how to install Qt on Linux: https://web.stanford.edu/dept/cs_edu/resources/qt/install-linux They aren't explicit about the Qt version the instructions at targeting, but there is a screenshot showing v6.5. I was aiming for v6.6.1 using Creator v12.0.1 and this worked for that as well.

                                          That link says before doing anything (including running the installer) do this:

                                          sudo apt-get update && sudo apt-get upgrade

                                          That's obvious, of course, since it's the first step to most every such problem!

                                          Then, they say do this:

                                          sudo apt-get -y install build-essential openssl libssl-dev libssl1.0 libgl1-mesa-dev libqt5x11extras5 '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev

                                          Once I ran that, the problem was resolved!

                                          This is a shotgun approach, which I did rather blindly (as is common to do with cutting & pasting suggested solutions into Linux terminals when we just want to move forward without a deep dive!). I'm not sure that all of that is really needed (like qt 5 stuff?). It seems likely those are all the dependencies from whatever specifically those students needed for their project. If anyone wants to try this one-by-one and confirm the exact minimum requirements, that would be great! I figure I'll do that at some point, but not today...

                                          1 Reply Last reply
                                          0

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