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qt.qpa.xcb: could not connect to display :1.0 qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

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  • B B_R_Khan

    @JonB

    I get this when I run gnuplot commands after export QT_DEBUG_PLUGINS=1:

    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)
    
    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by
    #16

    @B_R_Khan
    I am really surprised. If you look at anyone else reporting this or similar issues you will see they get voluminous diagnostic output. Are you setting the environment variable in a shell/terminal and running your application from there after setting the variable? If the output is not markedly different with and without that variable set it does not sound right.

    B 1 Reply Last reply
    0
    • JonBJ JonB

      @B_R_Khan
      I am really surprised. If you look at anyone else reporting this or similar issues you will see they get voluminous diagnostic output. Are you setting the environment variable in a shell/terminal and running your application from there after setting the variable? If the output is not markedly different with and without that variable set it does not sound right.

      B Offline
      B Offline
      B_R_Khan
      wrote on last edited by B_R_Khan
      #17

      @JonB

      I ran export QT_DEBUG_PLUGINS=1 in a new terminal and then ran flameshot/ gnuplot commands . Flameshot gives:

      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)
      

      Gnuplot gives following when I try to plot anything:

      Terminal type is now 'qt'
      gnuplot> plot sin(x)/x  
      QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/gnuplot/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.
      
      Could not connect to existing gnuplot_qt. Starting a new one.
      QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/gnuplot/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.
      

      I hope I followed your instructions correctly . I am using paraview as well which requires qt and it is running fine.
      I also want to mention that I get the following when I try the command qmake --version:
      QMake version 3.1
      Using Qt version 5.12.8 in /usr/lib/x86_64-linux-gnu

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #18

        What output do you get from paraview if you set QT_DEBUG_PLUGINS to 1 ?

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

        B 1 Reply Last reply
        2
        • SGaistS SGaist

          What output do you get from paraview if you set QT_DEBUG_PLUGINS to 1 ?

          B Offline
          B Offline
          B_R_Khan
          wrote on last edited by
          #19

          @SGaist
          I get the following output:

          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforms" ...
          QFactoryLoader::QFactoryLoader() looking at "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforms/libqxcb.so"
          Found metadata in lib /home/b/OpenFOAM/ParaView-5.9.1/plugins/platforms/libqxcb.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
              "MetaData": {
                  "Keys": [
                      "xcb"
                  ]
              },
              "archreq": 0,
              "className": "QXcbIntegrationPlugin",
              "debug": false,
              "version": 330752
          }
          
          
          Got keys from plugin meta data ("xcb")
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/platforms" ...
          loaded library "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforms/libqxcb.so"
          loaded library "Xcursor"
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platformthemes" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/platformthemes" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforminputcontexts" ...
          QFactoryLoader::QFactoryLoader() looking at "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
          Found metadata in lib /home/b/OpenFOAM/ParaView-5.9.1/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
          {
              "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
              "MetaData": {
                  "Keys": [
                      "compose",
                      "xim"
                  ]
              },
              "archreq": 0,
              "className": "QComposePlatformInputContextPlugin",
              "debug": false,
              "version": 330752
          }
          
          
          Got keys from plugin meta data ("compose", "xim")
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/platforminputcontexts" ...
          loaded library "/home/b/OpenFOAM/ParaView-5.9.1/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/styles" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/styles" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/iconengines" ...
          QFactoryLoader::QFactoryLoader() looking at "/home/b/OpenFOAM/ParaView-5.9.1/plugins/iconengines/libqsvgicon.so"
          Found metadata in lib /home/b/OpenFOAM/ParaView-5.9.1/plugins/iconengines/libqsvgicon.so, metadata=
          {
              "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
              "MetaData": {
                  "Keys": [
                      "svg",
                      "svgz",
                      "svg.gz"
                  ]
              },
              "archreq": 0,
              "className": "QSvgIconPlugin",
              "debug": false,
              "version": 330752
          }
          
          
          Got keys from plugin meta data ("svg", "svgz", "svg.gz")
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/iconengines" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/imageformats" ...
          QFactoryLoader::QFactoryLoader() looking at "/home/b/OpenFOAM/ParaView-5.9.1/plugins/imageformats/libqsvg.so"
          Found metadata in lib /home/b/OpenFOAM/ParaView-5.9.1/plugins/imageformats/libqsvg.so, metadata=
          {
              "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
              "MetaData": {
                  "Keys": [
                      "svg",
                      "svgz"
                  ],
                  "MimeTypes": [
                      "image/svg+xml",
                      "image/svg+xml-compressed"
                  ]
              },
              "archreq": 0,
              "className": "QSvgPlugin",
              "debug": false,
              "version": 330752
          }
          
          
          Got keys from plugin meta data ("svg", "svgz")
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/imageformats" ...
          loaded library "/home/b/OpenFOAM/ParaView-5.9.1/plugins/imageformats/libqsvg.so"
          loaded library "/home/b/OpenFOAM/ParaView-5.9.1/plugins/iconengines/libqsvgicon.so"
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/accessible" ...
          QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/bin/accessible" ...
          VisRTX 0.1.6, using devices:
           0: NVIDIA GeForce RTX 3050 Ti Laptop GPU (Total: 4.1 GB, Available: 4.0 GB)
          debug: In unknown, line 0
          debug: QFactoryLoader::QFactoryLoader() checking directory path "/home/b/OpenFOAM/ParaView-5.9.1/plugins/xcbglintegrations" ...
          debug: In unknown, line 0
          debug: QFactoryLoader::QFactoryLoader() looking at "/home/b/OpenFOAM/ParaView-5.9.1/plugins/xcbglintegrations/libqxcb-glx-integration.so"
          
          1 Reply Last reply
          0
          • hskoglundH Offline
            hskoglundH Offline
            hskoglund
            wrote on last edited by
            #20

            Hi, paraview works because is using it's own Qt (version 5.9.1).
            On the same PC you also have Qt version 5.12.8 and 5.12.9 installed. Having more than one version of Qt installed on the same computer is always risky :.-(
            Try to get rid of that qt5-default Qt version 5.12.8 and instead install complete versions of flameshot and gnuplot (so that they get also get their own, internal Qt version, like paraview has now).

            1 Reply Last reply
            1
            • M Offline
              M Offline
              muhammad4997
              wrote on last edited by
              #21

              I am using a remote Jupyter notebook and trying to start the qtconsole but getting the following error.

              qt.qpa.xcb: could not connect to display :0
              qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
              This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

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

              I have tried both
              export DISPLAY=:0
              $
              export DISPLAY=:1

              1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #22

                When you say remote, how are you accessing it ?

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

                M 1 Reply Last reply
                0
                • SGaistS SGaist

                  When you say remote, how are you accessing it ?

                  M Offline
                  M Offline
                  muhammad4997
                  wrote on last edited by muhammad4997
                  #23

                  @SGaist I access it via IP and port like
                  http://<IP>:8999

                  The Jupyter is deployed on another server machine

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #24

                    So you have a JupyterLab session running ?

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

                    M 1 Reply Last reply
                    0
                    • SGaistS SGaist

                      So you have a JupyterLab session running ?

                      M Offline
                      M Offline
                      muhammad4997
                      wrote on last edited by
                      #25

                      @SGaist No its not a JupyterLab session. It is only notebook running on a remote machine. On remote machine i installed it via
                      "pip install notebook"

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #26

                        What is your exact setup ?
                        You seem to be running your notebook in a browser.

                        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
                        • SGaistS SGaist

                          Hi,

                          Any chances that your desktop environment runs on top of Wayland ?

                          What are you currently using ?

                          X Offline
                          X Offline
                          Ximeng
                          wrote on last edited by
                          #27

                          @SGaist Hello, I got the same problem as this post "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. And I am installing code_saturne v7.2.0 in WSL ubuntu 20.04.5. It seems like my laptop environment runs on Wayland, since when I use synaptic, it showed that: 'Probably you're running Synaptic on Wayland with root permission.
                          Please restart your session without Wayland, or run Synaptic without root permission.'
                          Do you have any suggestions about this? Very appreciate.

                          SGaistS 1 Reply Last reply
                          0
                          • X Ximeng

                            @SGaist Hello, I got the same problem as this post "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. And I am installing code_saturne v7.2.0 in WSL ubuntu 20.04.5. It seems like my laptop environment runs on Wayland, since when I use synaptic, it showed that: 'Probably you're running Synaptic on Wayland with root permission.
                            Please restart your session without Wayland, or run Synaptic without root permission.'
                            Do you have any suggestions about this? Very appreciate.

                            SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #28

                            @Ximeng hi and welcome to devnet,

                            Did you try to use the Qt version provided by your distribution ? It should be configured to be directly usable under Wayland.

                            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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