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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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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #15

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

    QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqminimalegl.so"
    Got keys from plugin meta data ("minimalegl")
    QFactoryLoader::QFactoryLoader() looking at "/usr/bin/platforms/libqoffscreen.so"
    Got

    Hi,

    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to get more information.

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

    ali-aydinA 1 Reply Last reply
    0
    • S Offline
      S Offline
      Srinivas Reddy
      wrote on last edited by
      #16

      I am using Qt-5.15.0, got the same problem.
      More details are:
      QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

      Solved by installing the dependent package.
      Command to install: sudo apt-get install libxcb-xinerama0

      J I O M C 11 Replies Last reply
      20
      • S Srinivas Reddy

        I am using Qt-5.15.0, got the same problem.
        More details are:
        QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

        Solved by installing the dependent package.
        Command to install: sudo apt-get install libxcb-xinerama0

        J Offline
        J Offline
        JamieC
        wrote on last edited by
        #17

        Fresh install had the same issues reported here. Did what @Srinivas-Reddy suggested and install libxcb-xinerama0 and everything started working. Thanks!

        P 1 Reply Last reply
        2
        • J JamieC

          Fresh install had the same issues reported here. Did what @Srinivas-Reddy suggested and install libxcb-xinerama0 and everything started working. Thanks!

          P Offline
          P Offline
          PabloC
          wrote on last edited by
          #18

          @JamieC I had the same problem, install libxcb-xinerama0 and I solved it, Thanks!

          1 Reply Last reply
          10
          • A Offline
            A Offline
            Advig
            wrote on last edited by
            #19

            Tried reinstalling libxcb and worked for me as well.

            J 1 Reply Last reply
            1
            • S Srinivas Reddy

              I am using Qt-5.15.0, got the same problem.
              More details are:
              QLibraryPrivate::loadPlugin failed on "/opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so" : "Cannot load library /opt/Qt/5.15.0/gcc_64/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: cannot open shared object file: No such file or directory)"

              Solved by installing the dependent package.
              Command to install: sudo apt-get install libxcb-xinerama0

              I Offline
              I Offline
              inbdz
              wrote on last edited by
              #20

              @Srinivas-Reddy many thanks

              1 Reply Last reply
              0
              • L Offline
                L Offline
                Lengendary
                wrote on last edited by
                #21

                Thanks very much!
                I spent several hours trying to solve this problem until I got here.
                sudo apt-get install libxcb-xinerama0
                Thanks!

                A M R D 4 Replies Last reply
                10
                • L Lengendary

                  Thanks very much!
                  I spent several hours trying to solve this problem until I got here.
                  sudo apt-get install libxcb-xinerama0
                  Thanks!

                  A Offline
                  A Offline
                  artyjeep
                  wrote on last edited by
                  #22

                  @Lengendary Thank you!

                  1 Reply Last reply
                  0
                  • S Offline
                    S Offline
                    singhravi
                    wrote on last edited by
                    #23

                    Hey guys,

                    I'm getting the same error but not able to find any reason.
                    I'm building this project, https://github.com/BelledonneCommunications/linphone-desktop
                    and getting the error,

                    (linphone) ➜  Packages git:(master) ./Linphone-4.5.1.AppImage 
                    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: xcb.
                    
                    [1]    28317 abort (core dumped)  ./Linphone-4.5.1.AppImage
                    (linphone) ➜  Packages git:(master) ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so                         
                    	linux-vdso.so.1 (0x00007ffe12cd8000)
                    	libQt5XcbQpa.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f79c2a18000)
                    	libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f79c27d3000)
                    	libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f79c251f000)
                    	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f79c2302000)
                    	libQt5Gui.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f79c1ab3000)
                    	libQt5DBus.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f79c1827000)
                    	libQt5Core.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f79c108c000)
                    	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f79c0e00000)
                    	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f79c0be1000)
                    	libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f79c09df000)
                    	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f79c07b7000)
                    	libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f79c05ad000)
                    	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f79c039b000)
                    	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f79c0063000)
                    	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f79bfcc5000)
                    	libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f79bfabd000)
                    	libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f79bf87e000)
                    	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f79bf67a000)
                    	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f79bf2f1000)
                    	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f79bf0d9000)
                    	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f79bece8000)
                    	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f79beae6000)
                    	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f79be7cf000)
                    	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f79be59d000)
                    	libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f79be36b000)
                    	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f79be11e000)
                    	libicui18n.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f79bdc85000)
                    	libicuuc.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f79bd8cd000)
                    	libicudata.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicudata.so.56 (0x00007f79bbeea000)
                    	/lib64/ld-linux-x86-64.so.2 (0x00007f79c2fbe000)
                    	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f79bbcb9000)
                    	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f79bba03000)
                    	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f79bb7ff000)
                    	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f79bb5f9000)
                    	libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f79bb3dd000)
                    	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f79bb16b000)
                    	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f79baee7000)
                    	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f79bacd2000)
                    	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f79baaca000)
                    	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f79ba8a4000)
                    	liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f79ba688000)
                    	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f79ba36c000)
                    	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f79ba157000)
                    

                    What could be the issue? Please suggest.
                    Please let me know if you need to know anything else for this.

                    S 1 Reply Last reply
                    0
                    • S singhravi

                      Hey guys,

                      I'm getting the same error but not able to find any reason.
                      I'm building this project, https://github.com/BelledonneCommunications/linphone-desktop
                      and getting the error,

                      (linphone) ➜  Packages git:(master) ./Linphone-4.5.1.AppImage 
                      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: xcb.
                      
                      [1]    28317 abort (core dumped)  ./Linphone-4.5.1.AppImage
                      (linphone) ➜  Packages git:(master) ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so                         
                      	linux-vdso.so.1 (0x00007ffe12cd8000)
                      	libQt5XcbQpa.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f79c2a18000)
                      	libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f79c27d3000)
                      	libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f79c251f000)
                      	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f79c2302000)
                      	libQt5Gui.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f79c1ab3000)
                      	libQt5DBus.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f79c1827000)
                      	libQt5Core.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f79c108c000)
                      	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f79c0e00000)
                      	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f79c0be1000)
                      	libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f79c09df000)
                      	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f79c07b7000)
                      	libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f79c05ad000)
                      	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f79c039b000)
                      	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f79c0063000)
                      	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f79bfcc5000)
                      	libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f79bfabd000)
                      	libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f79bf87e000)
                      	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f79bf67a000)
                      	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f79bf2f1000)
                      	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f79bf0d9000)
                      	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f79bece8000)
                      	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f79beae6000)
                      	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f79be7cf000)
                      	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f79be59d000)
                      	libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f79be36b000)
                      	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f79be11e000)
                      	libicui18n.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f79bdc85000)
                      	libicuuc.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f79bd8cd000)
                      	libicudata.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicudata.so.56 (0x00007f79bbeea000)
                      	/lib64/ld-linux-x86-64.so.2 (0x00007f79c2fbe000)
                      	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f79bbcb9000)
                      	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f79bba03000)
                      	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f79bb7ff000)
                      	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f79bb5f9000)
                      	libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f79bb3dd000)
                      	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f79bb16b000)
                      	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f79baee7000)
                      	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f79bacd2000)
                      	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f79baaca000)
                      	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f79ba8a4000)
                      	liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f79ba688000)
                      	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f79ba36c000)
                      	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f79ba157000)
                      

                      What could be the issue? Please suggest.
                      Please let me know if you need to know anything else for this.

                      S Offline
                      S Offline
                      singhravi
                      wrote on last edited by
                      #24

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

                      Hey guys,

                      I'm getting the same error but not able to find any reason.
                      I'm building this project, https://github.com/BelledonneCommunications/linphone-desktop
                      and getting the error,

                      (linphone) ➜  Packages git:(master) ./Linphone-4.5.1.AppImage 
                      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: xcb.
                      
                      [1]    28317 abort (core dumped)  ./Linphone-4.5.1.AppImage
                      (linphone) ➜  Packages git:(master) ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so                         
                      	linux-vdso.so.1 (0x00007ffe12cd8000)
                      	libQt5XcbQpa.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f79c2a18000)
                      	libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f79c27d3000)
                      	libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f79c251f000)
                      	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f79c2302000)
                      	libQt5Gui.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f79c1ab3000)
                      	libQt5DBus.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f79c1827000)
                      	libQt5Core.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f79c108c000)
                      	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f79c0e00000)
                      	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f79c0be1000)
                      	libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f79c09df000)
                      	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f79c07b7000)
                      	libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f79c05ad000)
                      	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f79c039b000)
                      	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f79c0063000)
                      	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f79bfcc5000)
                      	libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f79bfabd000)
                      	libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f79bf87e000)
                      	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f79bf67a000)
                      	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f79bf2f1000)
                      	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f79bf0d9000)
                      	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f79bece8000)
                      	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f79beae6000)
                      	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f79be7cf000)
                      	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f79be59d000)
                      	libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f79be36b000)
                      	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f79be11e000)
                      	libicui18n.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f79bdc85000)
                      	libicuuc.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f79bd8cd000)
                      	libicudata.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicudata.so.56 (0x00007f79bbeea000)
                      	/lib64/ld-linux-x86-64.so.2 (0x00007f79c2fbe000)
                      	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f79bbcb9000)
                      	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f79bba03000)
                      	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f79bb7ff000)
                      	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f79bb5f9000)
                      	libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f79bb3dd000)
                      	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f79bb16b000)
                      	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f79baee7000)
                      	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f79bacd2000)
                      	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f79baaca000)
                      	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f79ba8a4000)
                      	liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f79ba688000)
                      	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f79ba36c000)
                      	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f79ba157000)
                      

                      What could be the issue? Please suggest.
                      Please let me know if you need to know anything else for this.

                      Hey @SGaist , Can you please suggest anything for this?

                      SGaistS 1 Reply Last reply
                      0
                      • S singhravi

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

                        Hey guys,

                        I'm getting the same error but not able to find any reason.
                        I'm building this project, https://github.com/BelledonneCommunications/linphone-desktop
                        and getting the error,

                        (linphone) ➜  Packages git:(master) ./Linphone-4.5.1.AppImage 
                        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: xcb.
                        
                        [1]    28317 abort (core dumped)  ./Linphone-4.5.1.AppImage
                        (linphone) ➜  Packages git:(master) ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so                         
                        	linux-vdso.so.1 (0x00007ffe12cd8000)
                        	libQt5XcbQpa.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5 (0x00007f79c2a18000)
                        	libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f79c27d3000)
                        	libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f79c251f000)
                        	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f79c2302000)
                        	libQt5Gui.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Gui.so.5 (0x00007f79c1ab3000)
                        	libQt5DBus.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5DBus.so.5 (0x00007f79c1827000)
                        	libQt5Core.so.5 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libQt5Core.so.5 (0x00007f79c108c000)
                        	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f79c0e00000)
                        	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f79c0be1000)
                        	libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f79c09df000)
                        	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f79c07b7000)
                        	libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f79c05ad000)
                        	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f79c039b000)
                        	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f79c0063000)
                        	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f79bfcc5000)
                        	libxkbcommon-x11.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f79bfabd000)
                        	libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f79bf87e000)
                        	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f79bf67a000)
                        	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f79bf2f1000)
                        	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f79bf0d9000)
                        	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f79bece8000)
                        	libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f79beae6000)
                        	libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f79be7cf000)
                        	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f79be59d000)
                        	libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f79be36b000)
                        	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f79be11e000)
                        	libicui18n.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicui18n.so.56 (0x00007f79bdc85000)
                        	libicuuc.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicuuc.so.56 (0x00007f79bd8cd000)
                        	libicudata.so.56 => /home/ravi/Qt/5.12.9/gcc_64/plugins/platforms/../../lib/libicudata.so.56 (0x00007f79bbeea000)
                        	/lib64/ld-linux-x86-64.so.2 (0x00007f79c2fbe000)
                        	libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f79bbcb9000)
                        	libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f79bba03000)
                        	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f79bb7ff000)
                        	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f79bb5f9000)
                        	libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f79bb3dd000)
                        	libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f79bb16b000)
                        	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f79baee7000)
                        	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f79bacd2000)
                        	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f79baaca000)
                        	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f79ba8a4000)
                        	liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f79ba688000)
                        	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f79ba36c000)
                        	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f79ba157000)
                        

                        What could be the issue? Please suggest.
                        Please let me know if you need to know anything else for this.

                        Hey @SGaist , Can you please suggest anything for this?

                        SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #25

                        @singhravi run ldd on the plugin itself.

                        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

                          @singhravi run ldd on the plugin itself.

                          S Offline
                          S Offline
                          singhravi
                          wrote on last edited by
                          #26

                          @SGaist Thanks a lot for the reply!
                          Do you mean this? ldd ~/Qt/5.12.9/gcc_64/plugins/platforms/libqxcb.so
                          If yes, then I've included its output in the original comment.
                          Please let me know if this is not what you mean.

                          1 Reply Last reply
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #27

                            I missed that line.

                            I see that you have that issue with an AppImage, does it also happen with just your binary ?

                            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

                              I missed that line.

                              I see that you have that issue with an AppImage, does it also happen with just your binary ?

                              S Offline
                              S Offline
                              singhravi
                              wrote on last edited by
                              #28

                              @SGaist Nope. The created binary works fine.
                              Only the packaged Appimage gives this issue.
                              PS, sorry for the delay in comments as its blocking me for 600 seconds after a comment. SMH

                              1 Reply Last reply
                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #29

                                What are you using to create that AppImage ?

                                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

                                  What are you using to create that AppImage ?

                                  S Offline
                                  S Offline
                                  singhravi
                                  wrote on last edited by
                                  #30

                                  @SGaist
                                  I'm building this project from github, https://github.com/BelledonneCommunications/linphone-desktop.
                                  It has the everything included in its cmakelists.txt and I just need to add -DENABLE_APP_PACKAGING=YES to create the package.
                                  It uses linuxdeploy and linuxdeploy-plugin-qt for packaging.
                                  This is the script for packaging, https://github.com/BelledonneCommunications/linphone-desktop/blob/master/linphone-app/tools/create_appimage.sh

                                  S 1 Reply Last reply
                                  0
                                  • S singhravi

                                    @SGaist
                                    I'm building this project from github, https://github.com/BelledonneCommunications/linphone-desktop.
                                    It has the everything included in its cmakelists.txt and I just need to add -DENABLE_APP_PACKAGING=YES to create the package.
                                    It uses linuxdeploy and linuxdeploy-plugin-qt for packaging.
                                    This is the script for packaging, https://github.com/BelledonneCommunications/linphone-desktop/blob/master/linphone-app/tools/create_appimage.sh

                                    S Offline
                                    S Offline
                                    singhravi
                                    wrote on last edited by
                                    #31

                                    @SGaist
                                    I'm building this project from github, https://github.com/BelledonneCommunications/linphone-desktop.
                                    It has the everything included in its cmakelists.txt and I just need to add -DENABLE_APP_PACKAGING=YES to create the package.
                                    It uses linuxdeploy and linuxdeploy-plugin-qt for packaging.
                                    This is the script for packaging, https://github.com/BelledonneCommunications/linphone-desktop/blob/master/linphone-app/tools/create_appimage.sh

                                    Hey @SGaist , Please let me know if you need anyother information.

                                    1 Reply Last reply
                                    0
                                    • S Offline
                                      S Offline
                                      singhravi
                                      wrote on last edited by
                                      #32

                                      One thing I noted while running the Appimage with QT_DEBUG_PLUGINS=1 was that it was trying to load plugins from a directory in tmp directory which does not exists. I don't know if this is the correct behaviour.
                                      Following the log when i run the Appimage,

                                      QFactoryLoader::QFactoryLoader() checking directory path "/tmp/.mount_LinphoELXhn2/usr/plugins/platforms" ...
                                      QFactoryLoader::QFactoryLoader() looking at "/tmp/.mount_LinphoELXhn2/usr/plugins/platforms/libqxcb.so"
                                      Found metadata in lib /tmp/.mount_LinphoELXhn2/usr/plugins/platforms/libqxcb.so, metadata=
                                      {
                                          "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                                          "MetaData": {
                                              "Keys": [
                                                  "xcb"
                                              ]
                                          },
                                          "className": "QXcbIntegrationPlugin",
                                          "debug": false,
                                          "version": 329989
                                      }
                                      
                                      
                                      Got keys from plugin meta data ("xcb")
                                      QFactoryLoader::QFactoryLoader() checking directory path "/tmp/.mount_LinphoELXhn2/usr/bin/platforms" ...
                                      Cannot load library /tmp/.mount_LinphoELXhn2/usr/plugins/platforms/libqxcb.so: (/tmp/.mount_LinphoELXhn2/usr/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)
                                      QLibraryPrivate::loadPlugin failed on "/tmp/.mount_LinphoELXhn2/usr/plugins/platforms/libqxcb.so" : "Cannot load library /tmp/.mount_LinphoELXhn2/usr/plugins/platforms/libqxcb.so: (/tmp/.mount_LinphoELXhn2/usr/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol _ZN11QFontEngine14bitmapForGlyphEj6QFixedRK10QTransform version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)"
                                      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: xcb.
                                      
                                      [1]    7814 abort (core dumped)  ./Linphone-4.5.1.AppImage
                                      
                                      1 Reply Last reply
                                      0
                                      • hskoglundH Offline
                                        hskoglundH Offline
                                        hskoglund
                                        wrote on last edited by hskoglund
                                        #33

                                        Hi, AppImage extracts all the files into the /tmp directory, so it's expected that the files exist there (as long as the app runs).
                                        But it seems all Qt files are not from version Qt 5.12.9, the error is that libQt5XcbQpa.so.5 is looking for the function QFontEngine::bitmapForGlyph() in libQt5Gui.so.5 but it's not there. I think that function is maybe 6 years old, perhaps you any other (older) Qt version installed than 5.12.9?

                                        Edit: I greped the sources, the function signature was changed between 5.12.4 and 5.12.5:
                                        in Qt 5.12.4: QImage QFontEngine::bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform&);

                                        in Qt 5.12.5: QImage QFontEngine::bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform&, const QColor &);

                                        since libQt5XcbQpa.so.5 asks for the old one, most likely it's the other way around, i.e. libQt5XcbQpa.so.5 is from 5.12.4 (or older Qt version) and libQt5Gui.so.5 is from 5.12.9.

                                        S 1 Reply Last reply
                                        0
                                        • hskoglundH hskoglund

                                          Hi, AppImage extracts all the files into the /tmp directory, so it's expected that the files exist there (as long as the app runs).
                                          But it seems all Qt files are not from version Qt 5.12.9, the error is that libQt5XcbQpa.so.5 is looking for the function QFontEngine::bitmapForGlyph() in libQt5Gui.so.5 but it's not there. I think that function is maybe 6 years old, perhaps you any other (older) Qt version installed than 5.12.9?

                                          Edit: I greped the sources, the function signature was changed between 5.12.4 and 5.12.5:
                                          in Qt 5.12.4: QImage QFontEngine::bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform&);

                                          in Qt 5.12.5: QImage QFontEngine::bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform&, const QColor &);

                                          since libQt5XcbQpa.so.5 asks for the old one, most likely it's the other way around, i.e. libQt5XcbQpa.so.5 is from 5.12.4 (or older Qt version) and libQt5Gui.so.5 is from 5.12.9.

                                          S Offline
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                                          singhravi
                                          wrote on last edited by
                                          #34

                                          @hskoglund Thanks a lot for the explanation! This is great.
                                          Actually i've installed Qt 5.12.9 with the installer and all the other dependencies were installed using apt which i think must be causing the mismatch in compatible versions as 18.04 ubuntu could have old packages in its repo.
                                          So what do you suggest? should i down grade qt version or should i install newer dependency libraries by using some custom apt sources?

                                          1 Reply Last reply
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