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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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  • A Offline
    A Offline
    austom
    wrote on last edited by austom
    #1

    Hello guys!
    I am a new user of linux. My version of linux is CentOS Linux release 7.3.1611 (Core).The reason for this problem is because I am using a python script (matplotlib) for drawing.

    python3.7 ../../scripts/compare_design_to_control.py control.fasc design.fasc
    

    Then it shows :

    Got keys from plugin meta data ("xcb")
    QFactoryLoader::QFactoryLoader() looking at "/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4"
    QElfParser: '/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4' is not an ELF object (file too small)
    "'/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4' is not an ELF object (file too small)" 
             not a plugin
    QFactoryLoader::QFactoryLoader() checking directory path "/data/home/ldx022/miniconda3/envs/bio/bin/platforms" ...
    Cannot load library /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libqxcb.so: (libxcb-icccm.so.4: cannot open shared object file: No such file or directory)
    QLibraryPrivate::loadPlugin failed on "/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libqxcb.so" : "Cannot load library /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libqxcb.so: (libxcb-icccm.so.4: cannot open shared object file: No such file or directory)"
    qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    
    Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, webgl, xcb.
    
    Aborted
    
    

    I looked at lots of solutions to similar problems before asking this question.Unlike in the previous cases, since I am using the research group's server, I cannot use the simplest yum command to install the corresponding dependency libraries because I have no root premission. So I use a number of methods including the use of

    rpm2cpio XCB util - wm - 0.4.1-5. El7. Aarch64. RPM | cpio - idvm
    

    this command to the corresponding dependent libraries the installation of RPM package.After that I change the ~.bashrc file in a correct path:
    c23c69d2-a6bd-46a2-8d0d-6ad15fb4abad-image.png

    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/data/home/ldx022/lib/usr/lib64
    
    

    and use the ldd command it turns out the way doesn't work at all.

    (bio) [ldx022@mn01 my_files]$ cd /data/home/ldx022/miniconda3/envs/bio/plugins/platforms
    (bio) [ldx022@mn01 platforms]$ ldd libqxcb.so
    linux-vdso.so.1 =>  (0x00007ffe6d053000)
    	libQt5XcbQpa.so.5 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libQt5XcbQpa.so.5 (0x00007f4865f82000)
    	libfontconfig.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libfontconfig.so.1 (0x00007f4865f34000)
    	libfreetype.so.6 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libfreetype.so.6 (0x00007f4865e7b000)
    	libz.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libz.so.1 (0x00007f4865e5d000)
    	libQt5Gui.so.5 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libQt5Gui.so.5 (0x00007f48659fa000)
    	libQt5DBus.so.5 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libQt5DBus.so.5 (0x00007f4865992000)
    	libQt5Core.so.5 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libQt5Core.so.5 (0x00007f4865512000)
    	libGL.so.1 => /lib64/libGL.so.1 (0x00007f4865269000)
    	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f486504d000)
    	libX11-xcb.so.1 => /lib64/libX11-xcb.so.1 (0x00007f4864e4b000)
    	libxcb-icccm.so.4 => not found
    	libxcb-image.so.0 => not found
    	libxcb-atom.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-atom.so.1 (0x00007f4864c45000)
    	libxcb-aux.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-aux.so.0 (0x00007f4864a40000)
    	libxcb-event.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-event.so.1 (0x00007f486483b000)
    	libxcb-keysyms.so.1 => not found
    	libxcb-randr.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-randr.so.0 (0x00007f4864827000)
    	libxcb-render-util.so.0 => not found
    	libxcb-render.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-render.so.0 (0x00007f4864817000)
    	libxcb-shape.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-shape.so.0 (0x00007f4864810000)
    	libxcb-sync.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-sync.so.1 (0x00007f4864806000)
    	libxcb-xfixes.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-xfixes.so.0 (0x00007f48647fb000)
    	libxcb-xinerama.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-xinerama.so.0 (0x00007f48647f4000)
    	libxcb-xkb.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-xkb.so.1 (0x00007f48647d3000)
    	libxcb-xinput.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-xinput.so.0 (0x00007f48647ad000)
    	libxcb.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb.so.1 (0x00007f4864780000)
    	libxcb-shm.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxcb-shm.so.0 (0x00007f486477a000)
    	libXext.so.6 => /lib64/libXext.so.6 (0x00007f4864568000)
    	libX11.so.6 => /lib64/libX11.so.6 (0x00007f4864229000)
    	libSM.so.6 => /lib64/libSM.so.6 (0x00007f4864021000)
    	libICE.so.6 => /lib64/libICE.so.6 (0x00007f4863e05000)
    	libxkbcommon-x11.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxkbcommon-x11.so.0 (0x00007f4863dfa000)
    	libxkbcommon.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libxkbcommon.so.0 (0x00007f4863db7000)
    	libdl.so.2 => /lib64/libdl.so.2 (0x00007f4863bb3000)
    	libstdc++.so.6 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libstdc++.so.6 (0x00007f486399e000)
    	libm.so.6 => /lib64/libm.so.6 (0x00007f486369c000)
    	libgcc_s.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libgcc_s.so.1 (0x00007f4863682000)
    	libc.so.6 => /lib64/libc.so.6 (0x00007f48632c0000)
    	libxcb-icccm.so.4 => not found
    	libxcb-image.so.0 => not found
    	libxcb-keysyms.so.1 => not found
    	libxcb-render-util.so.0 => not found
    	libgthread-2.0.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libgthread-2.0.so.0 (0x00007f48632b9000)
    	libglib-2.0.so.0 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libglib-2.0.so.0 (0x00007f4863182000)
    	libxml2.so.2 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libxml2.so.2 (0x00007f4863019000)
    	libpng16.so.16 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libpng16.so.16 (0x00007f4862fe0000)
    	libdbus-1.so.3 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libdbus-1.so.3 (0x00007f4862f8a000)
    	libicui18n.so.58 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libicui18n.so.58 (0x00007f4862d0b000)
    	libicuuc.so.58 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libicuuc.so.58 (0x00007f4862b57000)
    	libicudata.so.58 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libicudata.so.58 (0x00007f4861255000)
    	libzstd.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/./libzstd.so.1 (0x00007f4861183000)
    	/lib64/ld-linux-x86-64.so.2 (0x00007f4866066000)
    	libGLX.so.0 => /lib64/libGLX.so.0 (0x00007f4860f50000)
    	libGLdispatch.so.0 => /lib64/libGLdispatch.so.0 (0x00007f4860c9a000)
    	libXau.so.6 => /lib64/libXau.so.6 (0x00007f4860a95000)
    	libuuid.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/libuuid.so.1 (0x00007f4860a8c000)
    	libpcre.so.1 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/././libpcre.so.1 (0x00007f4860a44000)
    	liblzma.so.5 => /data/home/ldx022/miniconda3/envs/bio/plugins/platforms/./../../lib/././liblzma.so.5 (0x00007f4860a1b000)
    	librt.so.1 => /lib64/librt.so.1 (0x00007f4860812000)
    
    

    libxcb-icccm.so.4 still cannot be found.I ran out the ideas of it.Any suggestions would be appreaciated!

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi and welcome to devnet,

      Did you check if ˋ/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4ˋ is somehow corrupted as the error message suggests ?

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

      1 Reply Last reply
      1
      • A Offline
        A Offline
        austom
        wrote on last edited by
        #3

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

        QFactoryLoader::QFactoryLoader() looking at "/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4"
        QElfParser: '/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4' is not an ELF object (file too small)
        "'/data/home/ldx022/miniconda3/envs/bio/plugins/platforms/libxcb-icccm.so.4' is not an ELF object (file too small)"
        not a plugin

        Thank you for your reply.
        You mean this section?
        2c25a122-b690-47de-af7e-feefd8a09b88-image.png

        I have created a corresponding soft link for libxcb-icccm.so.4 to the corresponding file in the corresponding folder.But it doesn't work at all.
        5d2688be-37bc-4464-bc8b-1211cd70956b-image.png

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          You should rather check your conda environment. That library should not be broken inside it.

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

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          • A Offline
            A Offline
            austom
            wrote on last edited by
            #5

            e372a61a-0ee3-40f0-9853-486d196d611b-image.png
            The environment variables look like this, but I still can't find what went wrong.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Not the environment variables, the conda environment content itself.

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

              A 1 Reply Last reply
              0
              • SGaistS SGaist

                Not the environment variables, the conda environment content itself.

                A Offline
                A Offline
                austom
                wrote on last edited by
                #7

                @SGaist
                Sorry I misunderstood.But how to check if there is a problem with the library?
                533ca26c-ab15-484c-97d7-2aada235cd38-image.png
                e0b3a415-49e2-4942-b3c2-1f57dd04f8a5-image.png
                I also created soft links in it.But that doesn't seem to work

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #8

                  The main issue from your picture seems that the library seems to be missing. You only have one link and not the final library itself.

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

                  A 1 Reply Last reply
                  0
                  • SGaistS SGaist

                    The main issue from your picture seems that the library seems to be missing. You only have one link and not the final library itself.

                    A Offline
                    A Offline
                    austom
                    wrote on last edited by
                    #9

                    @SGaist
                    I have downloaded the .rpm file and use the following command to install it.

                    rpm2cpio XCB util - wm - 0.4.1-5. El7. Aarch64. RPM | cpio - idvm
                    

                    But I didn't instaill it in the conda.Should I install them in the conda environment?
                    ed48ad87-78dc-48b7-9968-ca2a4365d4a7-image.png

                    1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #10

                      Wait, the original error was that there was an issue with the library file. Now you are modifying your system installation while I am suggesting to check the content of your conda environment.

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

                      A 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        Wait, the original error was that there was an issue with the library file. Now you are modifying your system installation while I am suggesting to check the content of your conda environment.

                        A Offline
                        A Offline
                        austom
                        wrote on last edited by
                        #11

                        @SGaist
                        You mean I can't use the soft link instead of original file in the conda environment?

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                        0
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #12

                          No, I mean you should search why your environment was corrupted rather than trying to force it working using libraires from somewhere else.

                          One simple way would be to create a new environment from scratch to see if you have the same issue.

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

                          A 1 Reply Last reply
                          0
                          • SGaistS SGaist

                            No, I mean you should search why your environment was corrupted rather than trying to force it working using libraires from somewhere else.

                            One simple way would be to create a new environment from scratch to see if you have the same issue.

                            A Offline
                            A Offline
                            austom
                            wrote on last edited by
                            #13

                            @SGaist I have created a new conda environment. But the problem remains unresolved.The entire process of creating an environment from scratch is as follows.
                            11b3a05f-b9a8-4421-84f0-d862a02e98f4-image.png
                            367296fe-b7aa-4e07-892e-ec831f38f6b9-image.png
                            249ba189-3392-43b2-84cd-100fccfab52e-image.png
                            a25c8969-b1da-4cf3-aa13-be7546284442-image.png

                            1 Reply Last reply
                            0
                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              Please stop installing system packages in your conda environment. The goal of a new environnement is to start debugging your issue from scratch.

                              So please, create a new environment without installing anything other than conda packages.

                              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
                              • A Offline
                                A Offline
                                alex smith
                                wrote on last edited by
                                #15

                                On Linux, the xcb QPA (Qt Platform Abstraction) platform plugin is used. It provides the basic functionality needed by Qt GUI and Qt Widgets to run against X11. Its library dependencies are described the following table..

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