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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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  • M mywings19

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

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

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

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

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

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

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

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

    In that case when does the message you showed earlier:

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

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

    M 1 Reply Last reply
    0
    • JonBJ JonB

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

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

      In that case when does the message you showed earlier:

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

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

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

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

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

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

      In that case when does the message you showed earlier:

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

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

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

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

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

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

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

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

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

          1 Reply Last reply
          0
          • T trimixotun

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

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

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

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

            Simple solution:

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

            All work, folks.

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

            @trimixotun this worked!! Thank you so much!

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

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

              Then, things work fine.

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

                Hi,

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

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

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

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

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

                Any thoughts?
                Thanks a lot

                SGaistS 1 Reply Last reply
                0
                • R roux.benoit

                  Hi,

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

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

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

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

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

                  Any thoughts?
                  Thanks a lot

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

                  @roux-benoit hi,

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

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

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

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

                    the error:

                    qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
``
                    JonBJ 1 Reply Last reply
                    0
                    • P phil-lipp

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

                      the error:

                      qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
``
                      JonBJ Offline
                      JonBJ Offline
                      JonB
                      wrote on last edited by
                      #150

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

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

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

                        export QT_DEBUG_PLUGINS=1

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

                        example:
                        python main.py

                        qt.core.plugin.factoryloader: checking directory path "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms" ...
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archlevel": 1,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimal.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archlevel": 1,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqeglfs.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archlevel": 1,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archlevel": 1,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wayland-egl")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archlevel": 1,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archlevel": 1,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvnc.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archlevel": 1,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqvkkhrdisplay.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vkkhrdisplay"
        ]
    },
    "archlevel": 1,
    "className": "QVkKhrDisplayIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archlevel": 1,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
qt.core.plugin.factoryloader: looking at "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so"
qt.core.plugin.loader: Found metadata in lib /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archlevel": 1,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 394496
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ...
qt.core.library: "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" cannot load: Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so: (libxcb-cursor.so.0: cannot open shared object file: No such file or directory)
qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "/home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/user/.local/lib/python3.11/site-packages/PySide6/Qt/plugins/platforms/libqxcb.so: (libxcb-cursor.so.0: cannot open shared object file: No such file or directory)"
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

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

zsh: IOT instruction  python main.py

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

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

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

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

                        This must show you the next thing :

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

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

                            libxcb-cursor.so.0 => not found

                        Just thus easier to fix it , is using :

                        sudo apt install libxcb-cursor0

                        In your case could be another like: libxcb-randr0

                        1 Reply Last reply
                        1
                        • T twar

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

                          ~ $ qtcreator
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

Aborted (core dumped)

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

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

                          Thank you and best regards.

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

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

                          F O 2 Replies Last reply
                          2
                          • I IuriiV

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

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

                            @IuriiV Thank you, it solved for me too.

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

                              qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
                              This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

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

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

                              sudo apt-get install libxkbcommon-x11-dev

                              sudo apt-get install libxcb-xinerama0

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

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

                              jsulmJ 1 Reply Last reply
                              0
                              • B booter

                                qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
                                This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

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

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

                                sudo apt-get install libxkbcommon-x11-dev

                                sudo apt-get install libxcb-xinerama0

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

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

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

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

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

                                S 1 Reply Last reply
                                1
                                • 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

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