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  4. [SOLVED] qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
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[SOLVED] qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""

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  • P PieBru

    Hi there,
    I'm on Arch Linux X64 Gnome3 and I tried installing urh (https://github.com/jopohl/urh), which is based on python3-pyqt5.
    I get the following error, which persists after reinstalling urh, libxcb, and the whole qt:

    $ urh
    Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
    QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/python3.8/site-packages/PyQt5/Qt/plugins/platforms" ...
    QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    
    Aborted (core dumped)
    

    This post didn't help in my case:
    https://forum.qt.io/topic/93247/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found

    Any hint on how to proceed to sort this out?
    Thanks,
    Piero

    raven-worxR Offline
    raven-worxR Offline
    raven-worx
    Moderators
    wrote on last edited by
    #2

    @PieBru
    so what is the output of ldd /usr/lib/qt/plugins/platforms/libqxcb.so?

    --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
    If you have a question please use the forum so others can benefit from the solution in the future

    P 1 Reply Last reply
    1
    • raven-worxR raven-worx

      @PieBru
      so what is the output of ldd /usr/lib/qt/plugins/platforms/libqxcb.so?

      P Offline
      P Offline
      PieBru
      wrote on last edited by
      #3

      Thank you for the reply @raven-worx , here it is:

      $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
      	linux-vdso.so.1 (0x00007fff86527000)
      	libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007fec9f498000)
      	libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007fec9edef000)
      	libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007fec9e8b6000)
      	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007fec9e6cd000)
      	libc.so.6 => /usr/lib/libc.so.6 (0x00007fec9e507000)
      	libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007fec9e4bf000)
      	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007fec9e3ef000)
      	libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007fec9e354000)
      	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007fec9e332000)
      	libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007fec9e32d000)
      	libxcb-xinput.so.0 => /usr/lib/libxcb-xinput.so.0 (0x00007fec9e308000)
      	libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007fec9e103000)
      	libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007fec9defc000)
      	libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007fec9def7000)
      	libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007fec9dcf4000)
      	libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007fec9dce2000)
      	libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007fec9dade000)
      	libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007fec9dace000)
      	libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007fec9dac6000)
      	libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007fec9dabc000)
      	libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007fec9dab2000)
      	libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007fec9daad000)
      	libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007fec9da8f000)
      	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007fec9da65000)
      	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007fec9d923000)
      	libSM.so.6 => /usr/lib/libSM.so.6 (0x00007fec9d918000)
      	libICE.so.6 => /usr/lib/libICE.so.6 (0x00007fec9d8fb000)
      	libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007fec9d8f1000)
      	libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007fec9d8b0000)
      	libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007fec9d78b000)
      	libm.so.6 => /usr/lib/libm.so.6 (0x00007fec9d643000)
      	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fec9d629000)
      	libmd4c.so.0 => /usr/lib/libmd4c.so.0 (0x00007fec9d613000)
      	libGL.so.1 => /usr/lib/libGL.so.1 (0x00007fec9d58d000)
      	libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007fec9d555000)
      	libz.so.1 => /usr/lib/libz.so.1 (0x00007fec9d53b000)
      	libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007fec9d435000)
      	libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007fec9d38e000)
      	libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3 (0x00007fec9d377000)
      	libicui18n.so.65 => /usr/lib/libicui18n.so.65 (0x00007fec9d083000)
      	libicuuc.so.65 => /usr/lib/libicuuc.so.65 (0x00007fec9cea1000)
      	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007fec9ce9c000)
      	libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007fec9ce16000)
      	libzstd.so.1 => /usr/lib/libzstd.so.1 (0x00007fec9cd6c000)
      	/usr/lib64/ld-linux-x86-64.so.2 (0x00007fec9f636000)
      	libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007fec9cd3c000)
      	libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007fec9cd29000)
      	libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007fec9ccdf000)
      	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007fec9ccd8000)
      	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007fec9ccd0000)
      	libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007fec9caca000)
      	libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007fec9cac1000)
      	libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007fec9ca4e000)
      	libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007fec9c995000)
      	libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007fec9c962000)
      	libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007fec9c93d000)
      	librt.so.1 => /usr/lib/librt.so.1 (0x00007fec9c932000)
      	liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007fec9c90a000)
      	liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007fec9c8e8000)
      	libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007fec9c7c8000)
      	libicudata.so.65 => /usr/lib/libicudata.so.65 (0x00007fec9ad17000)
      	libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007fec9acf5000)
      
      raven-worxR 1 Reply Last reply
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      • P PieBru

        Thank you for the reply @raven-worx , here it is:

        $ ldd /usr/lib/qt/plugins/platforms/libqxcb.so
        	linux-vdso.so.1 (0x00007fff86527000)
        	libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007fec9f498000)
        	libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007fec9edef000)
        	libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007fec9e8b6000)
        	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007fec9e6cd000)
        	libc.so.6 => /usr/lib/libc.so.6 (0x00007fec9e507000)
        	libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007fec9e4bf000)
        	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007fec9e3ef000)
        	libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007fec9e354000)
        	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007fec9e332000)
        	libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007fec9e32d000)
        	libxcb-xinput.so.0 => /usr/lib/libxcb-xinput.so.0 (0x00007fec9e308000)
        	libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007fec9e103000)
        	libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007fec9defc000)
        	libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007fec9def7000)
        	libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007fec9dcf4000)
        	libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007fec9dce2000)
        	libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007fec9dade000)
        	libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007fec9dace000)
        	libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007fec9dac6000)
        	libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007fec9dabc000)
        	libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007fec9dab2000)
        	libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007fec9daad000)
        	libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007fec9da8f000)
        	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007fec9da65000)
        	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007fec9d923000)
        	libSM.so.6 => /usr/lib/libSM.so.6 (0x00007fec9d918000)
        	libICE.so.6 => /usr/lib/libICE.so.6 (0x00007fec9d8fb000)
        	libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007fec9d8f1000)
        	libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007fec9d8b0000)
        	libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007fec9d78b000)
        	libm.so.6 => /usr/lib/libm.so.6 (0x00007fec9d643000)
        	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fec9d629000)
        	libmd4c.so.0 => /usr/lib/libmd4c.so.0 (0x00007fec9d613000)
        	libGL.so.1 => /usr/lib/libGL.so.1 (0x00007fec9d58d000)
        	libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007fec9d555000)
        	libz.so.1 => /usr/lib/libz.so.1 (0x00007fec9d53b000)
        	libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007fec9d435000)
        	libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007fec9d38e000)
        	libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3 (0x00007fec9d377000)
        	libicui18n.so.65 => /usr/lib/libicui18n.so.65 (0x00007fec9d083000)
        	libicuuc.so.65 => /usr/lib/libicuuc.so.65 (0x00007fec9cea1000)
        	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007fec9ce9c000)
        	libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007fec9ce16000)
        	libzstd.so.1 => /usr/lib/libzstd.so.1 (0x00007fec9cd6c000)
        	/usr/lib64/ld-linux-x86-64.so.2 (0x00007fec9f636000)
        	libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007fec9cd3c000)
        	libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007fec9cd29000)
        	libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007fec9ccdf000)
        	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007fec9ccd8000)
        	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007fec9ccd0000)
        	libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007fec9caca000)
        	libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007fec9cac1000)
        	libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007fec9ca4e000)
        	libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007fec9c995000)
        	libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007fec9c962000)
        	libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007fec9c93d000)
        	librt.so.1 => /usr/lib/librt.so.1 (0x00007fec9c932000)
        	liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007fec9c90a000)
        	liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007fec9c8e8000)
        	libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007fec9c7c8000)
        	libicudata.so.65 => /usr/lib/libicudata.so.65 (0x00007fec9ad17000)
        	libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007fec9acf5000)
        
        raven-worxR Offline
        raven-worxR Offline
        raven-worx
        Moderators
        wrote on last edited by raven-worx
        #4

        @PieBru
        so your plugins are located in /usr/lib/qt/plugins but your Qt libs are in /usr/lib??
        Is this really correct?!
        I never used a installed Qt package on Linux, i always compiled it myself, thats why i am asking.
        Or did you even install it via the package manager?

        --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
        If you have a question please use the forum so others can benefit from the solution in the future

        P 1 Reply Last reply
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        • raven-worxR raven-worx

          @PieBru
          so your plugins are located in /usr/lib/qt/plugins but your Qt libs are in /usr/lib??
          Is this really correct?!
          I never used a installed Qt package on Linux, i always compiled it myself, thats why i am asking.
          Or did you even install it via the package manager?

          P Offline
          P Offline
          PieBru
          wrote on last edited by
          #5

          @raven-worx
          I installed via the Arch package manager, initially yay but then I tried also with the plain pacman
          /usr/lib contains libQt5* files, /usr/lib/qt/plugins/ contains plugins:

          $ ls -l /usr/lib/qt/plugins/
          total 0
          drwxr-xr-x 1 root root  42 11 feb 10.02 assetimporters
          drwxr-xr-x 1 root root  74 11 feb 10.02 audio
          drwxr-xr-x 1 root root 110 11 feb 10.02 bearer
          drwxr-xr-x 1 root root 198 11 feb 10.02 canbus
          drwxr-xr-x 1 root root 126 11 feb 18.18 designer
          drwxr-xr-x 1 root root 244 11 feb 10.02 egldeviceintegrations
          drwxr-xr-x 1 root root  70 11 feb 10.02 gamepads
          drwxr-xr-x 1 root root 314 11 feb 10.02 generic
          drwxr-xr-x 1 root root 102 11 feb 10.02 geometryloaders
          drwxr-xr-x 1 root root 316 11 feb 10.02 geoservices
          drwxr-xr-x 1 root root  28 11 feb 10.02 iconengines
          drwxr-xr-x 1 root root 230 11 feb 10.02 imageformats
          drwxr-xr-x 1 root root 280 11 feb 10.02 lipi_toolkit
          drwxr-xr-x 1 root root 160 11 feb 10.02 mediaservice
          drwxr-xr-x 1 root root 208 11 feb 10.02 platforminputcontexts
          drwxr-xr-x 1 root root 406 11 feb 10.02 platforms
          drwxr-xr-x 1 root root  68 11 feb 10.02 platformthemes
          drwxr-xr-x 1 root root  44 11 feb 10.02 playlistformats
          drwxr-xr-x 1 root root 156 11 feb 10.02 position
          drwxr-xr-x 1 root root  48 11 feb 10.02 printsupport
          drwxr-xr-x 1 root root  40 11 feb 18.18 PyQt5
          drwxr-xr-x 1 root root 460 11 feb 10.02 qmltooling
          drwxr-xr-x 1 root root  26 11 feb 10.02 renderplugins
          drwxr-xr-x 1 root root 130 11 feb 10.02 sceneparsers
          drwxr-xr-x 1 root root 126 11 feb 10.02 sensorgestures
          drwxr-xr-x 1 root root 158 11 feb 10.02 sensors
          drwxr-xr-x 1 root root 168 11 feb 10.02 sqldrivers
          drwxr-xr-x 1 root root 106 11 feb 10.02 texttospeech
          drwxr-xr-x 1 root root 416 11 feb 10.02 virtualkeyboard
          drwxr-xr-x 1 root root  28 11 feb 10.02 wayland-decoration-client
          drwxr-xr-x 1 root root 302 11 feb 10.02 wayland-graphics-integration-client
          drwxr-xr-x 1 root root 430 11 feb 10.02 wayland-graphics-integration-server
          drwxr-xr-x 1 root root 210 11 feb 10.02 wayland-shell-integration
          drwxr-xr-x 1 root root  50 11 feb 10.02 webview
          drwxr-xr-x 1 root root 104 11 feb 10.02 xcbglintegrations
          
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          • hskoglundH Offline
            hskoglundH Offline
            hskoglund
            wrote on last edited by hskoglund
            #6

            Hi, I think @raven-worx is on to something here, there's a problem with the location of Qt's files, but not a problem for libqxb.so for finding the .dlls it needs (that's why the ldd looks good) but rather a problem for your executable file urh to find the location of Qt's plugin files.

            I think you need to give urh a helping hand by creating a qt.conf file with this contents:

            [Paths]
            Plugins=/usr/lib/qt/plugins
            

            and place qt.conf in the same directory as the urh executable file

            P 1 Reply Last reply
            1
            • hskoglundH hskoglund

              Hi, I think @raven-worx is on to something here, there's a problem with the location of Qt's files, but not a problem for libqxb.so for finding the .dlls it needs (that's why the ldd looks good) but rather a problem for your executable file urh to find the location of Qt's plugin files.

              I think you need to give urh a helping hand by creating a qt.conf file with this contents:

              [Paths]
              Plugins=/usr/lib/qt/plugins
              

              and place qt.conf in the same directory as the urh executable file

              P Offline
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              PieBru
              wrote on last edited by
              #7

              @hskoglund
              I'm on Arch Linux, no luck by placing qt.conf in ~/.config/urh/ (together with urh.ini) and /usr/bin/ (where is located the urh executable).

              $ urh
              Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
              qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
              This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
              
              Aborted (core dumped)
              
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              • hskoglundH Offline
                hskoglundH Offline
                hskoglund
                wrote on last edited by
                #8

                No worries, there are other ways of setting the path, for example you could try exporting it as an environment variable, say like this:

                export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                urh
                

                If that doesn't work, also you can specify the path to libqxcb.so with a command argument to urh, like this:

                urh -platformpluginpath /usr/lib/qt/plugins/platforms
                

                (Note: this 2nd example only helps out with locating libqxcb.so, i.e. if urh needs more plugins to be loaded (and the 1st example above doesn't work) your still out of luck.)

                P P NoWhereMan1979N M 4 Replies Last reply
                3
                • hskoglundH hskoglund

                  No worries, there are other ways of setting the path, for example you could try exporting it as an environment variable, say like this:

                  export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                  urh
                  

                  If that doesn't work, also you can specify the path to libqxcb.so with a command argument to urh, like this:

                  urh -platformpluginpath /usr/lib/qt/plugins/platforms
                  

                  (Note: this 2nd example only helps out with locating libqxcb.so, i.e. if urh needs more plugins to be loaded (and the 1st example above doesn't work) your still out of luck.)

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                  PieBru
                  wrote on last edited by PieBru
                  #9

                  @hskoglund
                  Thank you much, both solutions works here!!!
                  The urh command now shows only the wayland warning, but it seems not harmful as the app window appears and it seems to work as expected.

                  Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
                  

                  Thank you again,
                  Piero

                  1 Reply Last reply
                  0
                  • hskoglundH hskoglund

                    No worries, there are other ways of setting the path, for example you could try exporting it as an environment variable, say like this:

                    export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                    urh
                    

                    If that doesn't work, also you can specify the path to libqxcb.so with a command argument to urh, like this:

                    urh -platformpluginpath /usr/lib/qt/plugins/platforms
                    

                    (Note: this 2nd example only helps out with locating libqxcb.so, i.e. if urh needs more plugins to be loaded (and the 1st example above doesn't work) your still out of luck.)

                    P Offline
                    P Offline
                    PabloC
                    wrote on last edited by
                    #10

                    @hskoglund Hi sorry for the question but, what is urh, i try to find information about it but i dont got it, i have te same problem but i cant find the urh thing, thanks!

                    1 Reply Last reply
                    0
                    • hskoglundH Offline
                      hskoglundH Offline
                      hskoglund
                      wrote on last edited by
                      #11

                      Hi, look at the first post on this page, urh stands for Universal Radio Hacker...

                      P 1 Reply Last reply
                      0
                      • hskoglundH hskoglund

                        Hi, look at the first post on this page, urh stands for Universal Radio Hacker...

                        P Offline
                        P Offline
                        PabloC
                        wrote on last edited by
                        #12

                        @hskoglund Thanks!

                        1 Reply Last reply
                        0
                        • hskoglundH hskoglund

                          No worries, there are other ways of setting the path, for example you could try exporting it as an environment variable, say like this:

                          export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                          urh
                          

                          If that doesn't work, also you can specify the path to libqxcb.so with a command argument to urh, like this:

                          urh -platformpluginpath /usr/lib/qt/plugins/platforms
                          

                          (Note: this 2nd example only helps out with locating libqxcb.so, i.e. if urh needs more plugins to be loaded (and the 1st example above doesn't work) your still out of luck.)

                          NoWhereMan1979N Offline
                          NoWhereMan1979N Offline
                          NoWhereMan1979
                          wrote on last edited by
                          #13

                          @hskoglund said in [SOLVED] qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "":

                          export QT_PLUGIN_PATH=/usr/lib/qt/plugins

                          Hi dear @hskoglund
                          Your efficient advises helped me too. just wanted to thank you.

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                          0
                          • G Offline
                            G Offline
                            goksan.isil
                            wrote on last edited by
                            #14

                            @NoWhereMan1979 said in [SOLVED] qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "":

                            @hskoglund

                            @hskoglund your export QT_PLUGIN_PATH=/usr/lib/qt/plugins advice has helped me too. THank you!

                            1 Reply Last reply
                            0
                            • hskoglundH hskoglund

                              No worries, there are other ways of setting the path, for example you could try exporting it as an environment variable, say like this:

                              export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                              urh
                              

                              If that doesn't work, also you can specify the path to libqxcb.so with a command argument to urh, like this:

                              urh -platformpluginpath /usr/lib/qt/plugins/platforms
                              

                              (Note: this 2nd example only helps out with locating libqxcb.so, i.e. if urh needs more plugins to be loaded (and the 1st example above doesn't work) your still out of luck.)

                              M Offline
                              M Offline
                              mol_
                              wrote on last edited by mol_
                              #15

                              @hskoglund thank you, I have tried your mentioned method and it works well.

                              export QT_PLUGIN_PATH=/usr/lib/qt/plugins
                              
                              1 Reply Last reply
                              0
                              • S Offline
                                S Offline
                                superdummy
                                wrote on last edited by
                                #16

                                Hi,
                                I experienced this problem on Debian 10 Buster after upgrading my Qt to 5.15.2 and QtCreator to 14.0
                                In the end the lib libxcb-util.so.1 was missing.

                                ldd /home/developer/Qt5/5.15.2/gcc_64/plugins/platforms/libqxcb.so
                                ...
                                libxcb-util.so.1 => not found
                                ...
                                

                                See here: https://bugreports.qt.io/browse/QTBUG-88688

                                A 1 Reply Last reply
                                1
                                • S superdummy

                                  Hi,
                                  I experienced this problem on Debian 10 Buster after upgrading my Qt to 5.15.2 and QtCreator to 14.0
                                  In the end the lib libxcb-util.so.1 was missing.

                                  ldd /home/developer/Qt5/5.15.2/gcc_64/plugins/platforms/libqxcb.so
                                  ...
                                  libxcb-util.so.1 => not found
                                  ...
                                  

                                  See here: https://bugreports.qt.io/browse/QTBUG-88688

                                  A Offline
                                  A Offline
                                  andreionea
                                  wrote on last edited by
                                  #17

                                  @superdummy worked for me

                                  1 Reply Last reply
                                  0
                                  • L Offline
                                    L Offline
                                    LiZheCN
                                    wrote on last edited by LiZheCN
                                    #18

                                    I stuck at this issue too.

                                    I set the environment variable export QT_PLUGIN_PATH=/usr/lib/qt/plugins.
                                    but not work.

                                    I run a python script use pyqt. Get the error message:

                                    QObject::moveToThread: Current thread (0x55e4e5df2060) is not the object's thread (0x55e4e61624e0).
                                    Cannot move to target thread (0x55e4e5df2060)
                                    
                                    qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/lizhe/.local/lib/python3.10/site-packages/cv2/qt/plugins" 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: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx.
                                    
                                    Aborted (core dumped)
                                    

                                    There is a file /home/lizhe/.local/lib/python3.10/site-packages/cv2/qt/plugins/platforms/libqxcb.so I move the libqxcb.so in upper dir, not work either.

                                    output of ldd /usr/lib/qt/plugins/platforms/libqxcb.so

                                    
                                    	linux-vdso.so.1 (0x00007ffe049cc000)
                                    	libQt5XcbQpa.so.5 => /usr/lib/libQt5XcbQpa.so.5 (0x00007f11af265000)
                                    	libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f11aebff000)
                                    	libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f11ae6e1000)
                                    	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f11ae4cb000)
                                    	libc.so.6 => /usr/lib/libc.so.6 (0x00007f11ae2ff000)
                                    	libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007f11ae2b0000)
                                    	libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f11ae1e3000)
                                    	libQt5DBus.so.5 => /usr/lib/libQt5DBus.so.5 (0x00007f11ae163000)
                                    	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f11ae142000)
                                    	libX11-xcb.so.1 => /usr/lib/libX11-xcb.so.1 (0x00007f11ae13d000)
                                    	libxcb-icccm.so.4 => /usr/lib/libxcb-icccm.so.4 (0x00007f11ae137000)
                                    	libxcb-image.so.0 => /usr/lib/libxcb-image.so.0 (0x00007f11ae131000)
                                    	libxcb-shm.so.0 => /usr/lib/libxcb-shm.so.0 (0x00007f11ae12a000)
                                    	libxcb-keysyms.so.1 => /usr/lib/libxcb-keysyms.so.1 (0x00007f11ae125000)
                                    	libxcb-randr.so.0 => /usr/lib/libxcb-randr.so.0 (0x00007f11ae113000)
                                    	libxcb-render-util.so.0 => /usr/lib/libxcb-render-util.so.0 (0x00007f11ae10d000)
                                    	libxcb-render.so.0 => /usr/lib/libxcb-render.so.0 (0x00007f11ae0fd000)
                                    	libxcb-shape.so.0 => /usr/lib/libxcb-shape.so.0 (0x00007f11ae0f8000)
                                    	libxcb-sync.so.1 => /usr/lib/libxcb-sync.so.1 (0x00007f11ae0ec000)
                                    	libxcb-xfixes.so.0 => /usr/lib/libxcb-xfixes.so.0 (0x00007f11ae0e2000)
                                    	libxcb-xinerama.so.0 => /usr/lib/libxcb-xinerama.so.0 (0x00007f11ae0dd000)
                                    	libxcb-xkb.so.1 => /usr/lib/libxcb-xkb.so.1 (0x00007f11ae0bf000)
                                    	libxcb-xinput.so.0 => /usr/lib/libxcb-xinput.so.0 (0x00007f11ae09a000)
                                    	libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f11ae070000)
                                    	libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f11adf2c000)
                                    	libSM.so.6 => /usr/lib/libSM.so.6 (0x00007f11adf22000)
                                    	libICE.so.6 => /usr/lib/libICE.so.6 (0x00007f11adf05000)
                                    	libxkbcommon-x11.so.0 => /usr/lib/libxkbcommon-x11.so.0 (0x00007f11adefb000)
                                    	libxkbcommon.so.0 => /usr/lib/libxkbcommon.so.0 (0x00007f11adeb2000)
                                    	libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f11add76000)
                                    	libm.so.6 => /usr/lib/libm.so.6 (0x00007f11adc30000)
                                    	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f11adc15000)
                                    	libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f11adb8f000)
                                    	libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f11adb58000)
                                    	libz.so.1 => /usr/lib/libz.so.1 (0x00007f11adb3e000)
                                    	libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007f11ada65000)
                                    	libmd4c.so.0 => /usr/lib/libmd4c.so.0 (0x00007f11ada4d000)
                                    	libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007f11ad971000)
                                    	libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3 (0x00007f11ad95b000)
                                    	libicui18n.so.70 => /usr/lib/libicui18n.so.70 (0x00007f11ad635000)
                                    	libicuuc.so.70 => /usr/lib/libicuuc.so.70 (0x00007f11ad439000)
                                    	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f11ad432000)
                                    	libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007f11ad3a3000)
                                    	libzstd.so.1 => /usr/lib/libzstd.so.1 (0x00007f11ad2cc000)
                                    	/usr/lib64/ld-linux-x86-64.so.2 (0x00007f11af3c5000)
                                    	libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007f11ad29c000)
                                    	libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f11ad289000)
                                    	libbrotlidec.so.1 => /usr/lib/libbrotlidec.so.1 (0x00007f11ad27b000)
                                    	libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007f11ad224000)
                                    	libxcb-util.so.1 => /usr/lib/libxcb-util.so.1 (0x00007f11ad21c000)
                                    	libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f11ad217000)
                                    	libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f11ad20f000)
                                    	libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007f11ad206000)
                                    	libpcre.so.1 => /usr/lib/libpcre.so.1 (0x00007f11ad18d000)
                                    	libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f11ad0d5000)
                                    	libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f11ad0a2000)
                                    	libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007f11ad07d000)
                                    	librt.so.1 => /usr/lib/librt.so.1 (0x00007f11ad072000)
                                    	liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f11ad047000)
                                    	liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007f11ad024000)
                                    	libcap.so.2 => /usr/lib/libcap.so.2 (0x00007f11ad018000)
                                    	libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007f11acedc000)
                                    	libicudata.so.70 => /usr/lib/libicudata.so.70 (0x00007f11ab2c0000)
                                    	libbrotlicommon.so.1 => /usr/lib/libbrotlicommon.so.1 (0x00007f11ab29b000)
                                    	libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007f11ab273000)
                                    

                                    System information:

                                     OS: Manjaro 21.2.2 Qonos
                                     Kernel: x86_64 Linux 5.15.16-1-MANJARO
                                     Uptime: 5h 18m
                                     Packages: 1396
                                     Shell: fish 3.3.1
                                     Resolution: 3840x1080
                                     DE: KDE5 / Plasma
                                     WM: KWin
                                     GTK Theme: Breeze [GTK2/3]
                                     Icon Theme: breeze-dark
                                     Disk: 31G / 236G (14%)
                                     CPU: Intel Core i7-7700K @ 8x 4.5GHz [44.0°C]
                                     GPU: Intel Corporation HD Graphics 630 (rev 04)
                                     RAM: 6722MiB / 15866MiB
                                     Python 3.10.1
                                    
                                    1 Reply Last reply
                                    0
                                    • hskoglundH Offline
                                      hskoglundH Offline
                                      hskoglund
                                      wrote on last edited by
                                      #19

                                      Hi, do you get the same error if you try a vanilla Hello World python app?
                                      Say like this:

                                      app = QApplication(sys,argv)
                                      window = QWidget()
                                      window.setWindowTitle('Hello world')
                                      window.setGeometry(100, 100, 640, 480)
                                      window.show()
                                      sys.exit(app.exec_())
                                      
                                      L 2 Replies Last reply
                                      0
                                      • hskoglundH hskoglund

                                        Hi, do you get the same error if you try a vanilla Hello World python app?
                                        Say like this:

                                        app = QApplication(sys,argv)
                                        window = QWidget()
                                        window.setWindowTitle('Hello world')
                                        window.setGeometry(100, 100, 640, 480)
                                        window.show()
                                        sys.exit(app.exec_())
                                        
                                        L Offline
                                        L Offline
                                        LiZheCN
                                        wrote on last edited by
                                        #20

                                        @hskoglund Without reboot a simple qt hello world project can run. After reboot every thing goes fine. Thank you for you time.

                                        1 Reply Last reply
                                        0
                                        • hskoglundH hskoglund

                                          Hi, do you get the same error if you try a vanilla Hello World python app?
                                          Say like this:

                                          app = QApplication(sys,argv)
                                          window = QWidget()
                                          window.setWindowTitle('Hello world')
                                          window.setGeometry(100, 100, 640, 480)
                                          window.show()
                                          sys.exit(app.exec_())
                                          
                                          L Offline
                                          L Offline
                                          LiZheCN
                                          wrote on last edited by LiZheCN
                                          #21

                                          @hskoglund Sorry to bother you again, the issue keep coming out after somethime. And I dont know how to solve it, for now.
                                          I cant start my kate(build-in editor in manajaro)
                                          26e0c01d-09b7-42dc-8aed-b5f01ba146cc-image.png

                                          And the error message is:

                                          QObject::moveToThread: Current thread (0x55b676c29770) is not the object's thread (0x55b676c337c0).
                                          Cannot move to target thread (0x55b676c29770)
                                          
                                          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/lizhe/.local/lib/python3.10/site-packages/cv2/qt/plugins" 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: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx.
                                          
                                          fish: Job 1, 'kate' terminated by signal SIGABRT (Abort)
                                          

                                          After the reboot the issue is gone for just a while. How to solve it?

                                          My system info is:

                                           OS: Manjaro 21.2.2 Qonos
                                           Kernel: x86_64 Linux 5.15.16-1-MANJARO
                                           Uptime: 8h 2m
                                           Packages: 1397
                                           Shell: python
                                           Resolution: 3840x1080
                                           DE: KDE5 / Plasma 
                                           WM: KWin
                                           GTK Theme: Breeze [GTK2/3]
                                           Icon Theme: breeze-dark
                                           Disk: 33G / 236G (15%)
                                           CPU: Intel Core i7-7700K @ 8x 4.5GHz [56.0°C]
                                           GPU: Intel Corporation HD Graphics 630 (rev 04)
                                           RAM: 7016MiB / 15866MiB
                                          
                                          Python 3.10.1
                                          
                                          NVIM v0.6.1
                                          Build type: Release
                                          LuaJIT 2.0.5
                                          Compiled by builduser
                                          
                                          Features: +acl +iconv +tui
                                          See ":help feature-compile"
                                          
                                             system vimrc file: "$VIM/sysinit.vim"
                                            fall-back for $VIM: "/usr/share/nvim"
                                          
                                          Run :checkhealth for more info
                                          
                                          alacritty 0.9.0 (fed349aa)
                                          
                                          

                                          See if you need other info?

                                          jsulmJ 1 Reply Last reply
                                          0

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