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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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  • H HlaElks

    Hi, the displayed message may indicate these two paths(

    /home/lis/.local/lib/python3.9/site-packages/cv2/qt/plugins/platforms/libqxcb.so
    /home/lis/.local/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so
    
    

    ) are mixed. How should I fix this? . Thanks!

    QFactoryLoader::QFactoryLoader() looking at "/home/lis/.local/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
    Found metadata in lib /home/lis/.local/lib/python3.9/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so, metadata=
    {
        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
        "MetaData": {
            "Keys": [
                "xcb"
            ]
        },
        "archreq": 0,
        "className": "QXcbIntegrationPlugin",
        "debug": false,
        "version": 331520
    }
    Got keys from plugin meta data ("xcb")
    QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
    loaded library "/home/lis/.local/lib/python3.9/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
    
    qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/lis/.local/lib/python3.9/site-packages/cv2/qt/plugins" even though it was found.
    
    
    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by
    #122

    @HlaElks
    I don't know which of the cv2 versus the PyQt5 ones you want/need to load. But if you want to find out why /home/lis/.local/lib/python3.9/site-packages/cv2/qt/plugins/platforms/libqxcb.so failed to load you might run ldd on it and examine the output for a missing dependency. Whether that is what you need to know I don't know.

    1 Reply Last reply
    0
    • A Offline
      A Offline
      actionmystique
      wrote on last edited by actionmystique
      #123

      Hi there. I've encountered the same type of issue when running Seagate's:

      ./run_SeaTools.sh
      qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
      

      I could not read all the posts in this thread, but I tried some of the proposed solutions which did not solve anything in my case:

      # apt install --reinstall libqt5gui5 qtbase5-dev qt5dxcb-plugin libxcb-xinerama0
      ...
      # export QT_DEBUG_PLUGINS=1
      # export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms
      # ./run_SeaTools.sh 
      qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
      This application failed to start because no Qt platform plugin could be initialized.
      ...
      

      Any suggestion?

      JonBJ SGaistS 2 Replies Last reply
      0
      • A actionmystique

        Hi there. I've encountered the same type of issue when running Seagate's:

        ./run_SeaTools.sh
        qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
        

        I could not read all the posts in this thread, but I tried some of the proposed solutions which did not solve anything in my case:

        # apt install --reinstall libqt5gui5 qtbase5-dev qt5dxcb-plugin libxcb-xinerama0
        ...
        # export QT_DEBUG_PLUGINS=1
        # export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms
        # ./run_SeaTools.sh 
        qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
        This application failed to start because no Qt platform plugin could be initialized.
        ...
        

        Any suggestion?

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #124

        @actionmystique
        As has been said many times, the first thing to try is running with environment variable QT_DEBUG_PLUGINS=1.
        When you have located the xcb .so file, you might also run ldd on it to see if that tells you anything is missing.

        1 Reply Last reply
        0
        • A actionmystique

          Hi there. I've encountered the same type of issue when running Seagate's:

          ./run_SeaTools.sh
          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
          

          I could not read all the posts in this thread, but I tried some of the proposed solutions which did not solve anything in my case:

          # apt install --reinstall libqt5gui5 qtbase5-dev qt5dxcb-plugin libxcb-xinerama0
          ...
          # export QT_DEBUG_PLUGINS=1
          # export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms
          # ./run_SeaTools.sh 
          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins:/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" even though it was found.
          This application failed to start because no Qt platform plugin could be initialized.
          ...
          

          Any suggestion?

          SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #125

          Hi

          @actionmystique why are you trying to run a GUI application as root ?

          How did you become root in the first place ?

          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
            actionmystique
            wrote on last edited by
            #126

            @SGaist

            why are you trying to run a GUI application as root ?

            root is required to run /usr/bin/env which is used in the script. I do no see any reason why being root may be the root ;-) cause for this issue.

            How did you become root in the first place ?

            Does it really matter?

            JonBJ 1 Reply Last reply
            0
            • A actionmystique

              @SGaist

              why are you trying to run a GUI application as root ?

              root is required to run /usr/bin/env which is used in the script. I do no see any reason why being root may be the root ;-) cause for this issue.

              How did you become root in the first place ?

              Does it really matter?

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #127

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

              root is required to run /usr/bin/env

              I do not know what platform/variant of Linux you are on, but since when has running /usr/bin/env ever required root permission/user to run??

              I do no see any reason why being root may be the root ;-) cause for this issue.

              Xorg does not like a root user to run UI applications if you are logged into it as a non-root user. (I don't know whether xhost +... would permit this.) I imagine that is why @SGaist is asking.

              A 1 Reply Last reply
              1
              • JonBJ JonB

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

                root is required to run /usr/bin/env

                I do not know what platform/variant of Linux you are on, but since when has running /usr/bin/env ever required root permission/user to run??

                I do no see any reason why being root may be the root ;-) cause for this issue.

                Xorg does not like a root user to run UI applications if you are logged into it as a non-root user. (I don't know whether xhost +... would permit this.) I imagine that is why @SGaist is asking.

                A Offline
                A Offline
                actionmystique
                wrote on last edited by
                #128

                @JonB

                I do not know what platform/variant of Linux you are on, but since when has running /usr/bin/env ever required root permission/user to run??

                I did not phrase it correctly; pkexec needs root to run env ; the script contains:

                pkexec env DISPLAY="$DISPLAY" XAUTHORITY="$XAUTHORITY" "$seadoctorDir"/exec-seatools-in-dir
                
                JonBJ 1 Reply Last reply
                0
                • A actionmystique

                  @JonB

                  I do not know what platform/variant of Linux you are on, but since when has running /usr/bin/env ever required root permission/user to run??

                  I did not phrase it correctly; pkexec needs root to run env ; the script contains:

                  pkexec env DISPLAY="$DISPLAY" XAUTHORITY="$XAUTHORITY" "$seadoctorDir"/exec-seatools-in-dir
                  
                  JonBJ Offline
                  JonBJ Offline
                  JonB
                  wrote on last edited by
                  #129

                  @actionmystique
                  If you are running as root but not logged on as root I still wonder if that is the issue.

                  Xorg

                  By default, and for security reasons, root will be unable to connect to a non-root user's X server. There are multiple ways of allowing root to do so however, if necessary.

                  https://wiki.archlinux.org/title/Running_GUI_applications_as_root

                  Maybe this is an issue, maybe it is not.

                  A 1 Reply Last reply
                  0
                  • JonBJ JonB

                    @actionmystique
                    If you are running as root but not logged on as root I still wonder if that is the issue.

                    Xorg

                    By default, and for security reasons, root will be unable to connect to a non-root user's X server. There are multiple ways of allowing root to do so however, if necessary.

                    https://wiki.archlinux.org/title/Running_GUI_applications_as_root

                    Maybe this is an issue, maybe it is not.

                    A Offline
                    A Offline
                    actionmystique
                    wrote on last edited by
                    #130

                    @JonB
                    I tried:

                    1. login as root: same result
                    2. add one policy kit file for env and for SeaTools: same result
                      org.freedesktop.policykit.pkexec.policy
                    <?xml version="1.0" encoding="UTF-8"?>
                    <!DOCTYPE policyconfig PUBLIC
                     "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
                     "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
                    <policyconfig>
                      <action id="org.freedesktop.policykit.pkexec.run-env">
                        <description>Run env</description>
                        <message>Authentication is required to run env</message>
                        <defaults>
                          <allow_any>no</allow_any>
                          <allow_inactive>no</allow_inactive>
                          <allow_active>auth_admin_keep</allow_active>
                        </defaults>
                        <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/env</annotate>
                        <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
                      </action>
                      <action id="org.freedesktop.policykit.pkexec.run-SeaTools">
                        <description>Run SeaTools</description>
                        <message>Authentication is required to run SeaTools</message>
                        <defaults>
                          <allow_any>no</allow_any>
                          <allow_inactive>no</allow_inactive>
                          <allow_active>auth_admin_keep</allow_active>
                        </defaults>
                        <annotate key="org.freedesktop.policykit.exec.path">/opt/SeaTools5/SeaTools</annotate>
                        <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
                      </action>
                    </policyconfig>
                    

                    However, I did notice one file which may or may not be adequate: qt.conf

                    # Generated by linuxdeployqt
                    # https://github.com/probonopd/linuxdeployqt/
                    [Paths]
                    Prefix = ./
                    Plugins = plugins
                    Imports = qml
                    Qml2Imports = qml
                    
                    A 1 Reply Last reply
                    0
                    • A actionmystique

                      @JonB
                      I tried:

                      1. login as root: same result
                      2. add one policy kit file for env and for SeaTools: same result
                        org.freedesktop.policykit.pkexec.policy
                      <?xml version="1.0" encoding="UTF-8"?>
                      <!DOCTYPE policyconfig PUBLIC
                       "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
                       "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
                      <policyconfig>
                        <action id="org.freedesktop.policykit.pkexec.run-env">
                          <description>Run env</description>
                          <message>Authentication is required to run env</message>
                          <defaults>
                            <allow_any>no</allow_any>
                            <allow_inactive>no</allow_inactive>
                            <allow_active>auth_admin_keep</allow_active>
                          </defaults>
                          <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/env</annotate>
                          <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
                        </action>
                        <action id="org.freedesktop.policykit.pkexec.run-SeaTools">
                          <description>Run SeaTools</description>
                          <message>Authentication is required to run SeaTools</message>
                          <defaults>
                            <allow_any>no</allow_any>
                            <allow_inactive>no</allow_inactive>
                            <allow_active>auth_admin_keep</allow_active>
                          </defaults>
                          <annotate key="org.freedesktop.policykit.exec.path">/opt/SeaTools5/SeaTools</annotate>
                          <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
                        </action>
                      </policyconfig>
                      

                      However, I did notice one file which may or may not be adequate: qt.conf

                      # Generated by linuxdeployqt
                      # https://github.com/probonopd/linuxdeployqt/
                      [Paths]
                      Prefix = ./
                      Plugins = plugins
                      Imports = qml
                      Qml2Imports = qml
                      
                      A Offline
                      A Offline
                      actionmystique
                      wrote on last edited by
                      #131

                      Has anyone tried to run SeaTools from seagate on Ubuntu?

                      1 Reply Last reply
                      0
                      • M Offline
                        M Offline
                        mywings19
                        wrote on last edited by
                        #132

                        hi,
                        I'm facing similar issue.could you give me some suggestion?
                        my QT version is:Qt Creator 8.0.1 based on Qt 6.3.1

                        the error message:
                        qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" 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: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

                        Then I've set 'export QT_DEBUG_PLUGINS=1'
                        but there's no extra error message,qtcreator is running normally

                        And I've run 'ldd libqxcb.so',result is

                                linux-vdso.so.1 (0x00007ffcdb970000)
                                libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f02bc4a5000)
                                libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f02bc476000)
                                libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f02bc434000)
                                libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f02bc42d000)
                                libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f02bc427000)
                                libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f02bc422000)
                                libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f02bc40e000)
                                libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f02bc407000)
                                libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f02bc402000)
                                libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f02bc3f8000)
                                libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f02bc3ee000)
                                libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f02bc3df000)
                                libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f02bc3d8000)
                                libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f02bc3ba000)
                                libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f02bc390000)
                                libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f02bc2ee000)
                                libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f02bb96b000)
                                libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f02bb8d7000)
                                libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f02bb272000)
                                libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f02bb26d000)
                                libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f02bb12c000)
                                libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f02bb127000)
                                libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f02bb106000)
                                libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f02baf82000)
                                libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f02badfd000)
                                libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f02bade3000)
                                libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f02bac22000)
                                libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f02bab03000)
                                libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f02baafe000)
                                libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f02baaf2000)
                                libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f02baaed000)
                                libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f02baae5000)
                                libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f02baad0000)
                                libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f02baa8a000)
                                libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f02ba9b8000)
                                libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f02ba99b000)
                                libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f02ba8df000)
                                libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f02ba8ab000)
                                libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f02ba7ee000)
                                libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f02ba353000)
                                libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f02b9f9b000)
                                libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f02b85b8000)
                                librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f02b85ae000)
                                /lib64/ld-linux-x86-64.so.2 (0x00007f02bc55d000)
                                libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f02b853a000)
                                libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f02b8520000)
                                libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f02b84e1000)
                                libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f02b84d8000)
                                libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f02b8485000)
                                libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f02b844c000)
                                libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f02b8437000)
                                libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f02b8394000)
                                liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f02b836c000)
                                liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f02b834d000)
                                libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f02b8228000)
                                libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f02b8205000)
                        

                        what to do next?thank you!

                        JonBJ 1 Reply Last reply
                        0
                        • M mywings19

                          hi,
                          I'm facing similar issue.could you give me some suggestion?
                          my QT version is:Qt Creator 8.0.1 based on Qt 6.3.1

                          the error message:
                          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" 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: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

                          Then I've set 'export QT_DEBUG_PLUGINS=1'
                          but there's no extra error message,qtcreator is running normally

                          And I've run 'ldd libqxcb.so',result is

                                  linux-vdso.so.1 (0x00007ffcdb970000)
                                  libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f02bc4a5000)
                                  libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f02bc476000)
                                  libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f02bc434000)
                                  libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f02bc42d000)
                                  libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f02bc427000)
                                  libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f02bc422000)
                                  libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f02bc40e000)
                                  libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f02bc407000)
                                  libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f02bc402000)
                                  libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f02bc3f8000)
                                  libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f02bc3ee000)
                                  libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f02bc3df000)
                                  libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f02bc3d8000)
                                  libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f02bc3ba000)
                                  libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f02bc390000)
                                  libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f02bc2ee000)
                                  libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f02bb96b000)
                                  libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f02bb8d7000)
                                  libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f02bb272000)
                                  libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f02bb26d000)
                                  libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f02bb12c000)
                                  libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f02bb127000)
                                  libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f02bb106000)
                                  libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f02baf82000)
                                  libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f02badfd000)
                                  libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f02bade3000)
                                  libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f02bac22000)
                                  libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f02bab03000)
                                  libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f02baafe000)
                                  libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f02baaf2000)
                                  libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f02baaed000)
                                  libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f02baae5000)
                                  libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f02baad0000)
                                  libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f02baa8a000)
                                  libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f02ba9b8000)
                                  libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f02ba99b000)
                                  libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f02ba8df000)
                                  libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f02ba8ab000)
                                  libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f02ba7ee000)
                                  libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f02ba353000)
                                  libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f02b9f9b000)
                                  libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f02b85b8000)
                                  librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f02b85ae000)
                                  /lib64/ld-linux-x86-64.so.2 (0x00007f02bc55d000)
                                  libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f02b853a000)
                                  libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f02b8520000)
                                  libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f02b84e1000)
                                  libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f02b84d8000)
                                  libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f02b8485000)
                                  libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f02b844c000)
                                  libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f02b8437000)
                                  libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f02b8394000)
                                  liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f02b836c000)
                                  liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f02b834d000)
                                  libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f02b8228000)
                                  libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f02b8205000)
                          

                          what to do next?thank you!

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #133

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

                          Then I've set 'export QT_DEBUG_PLUGINS=1'
                          but there's no extra error message,qtcreator is running normally

                          Have you actually run whatever executable raises the error (Qt Creator itself?? Your application?) from the shell where you set this environment variable, like all the posts tell you to? Because if so you should get a whole bunch of diagnostic output lines....

                          M 1 Reply Last reply
                          0
                          • JonBJ JonB

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

                            Then I've set 'export QT_DEBUG_PLUGINS=1'
                            but there's no extra error message,qtcreator is running normally

                            Have you actually run whatever executable raises the error (Qt Creator itself?? Your application?) from the shell where you set this environment variable, like all the posts tell you to? Because if so you should get a whole bunch of diagnostic output lines....

                            M Offline
                            M Offline
                            mywings19
                            wrote on last edited by
                            #134

                            @JonB

                            sugon@EC:~$ cat ~/.bashrc
                            # ~/.bashrc: executed by bash(1) for non-login shells.
                            # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
                            # for examples
                            
                            # If not running interactively, don't do anything
                            case $- in
                                *i*) ;;
                                  *) return;;
                            esac
                            
                            # don't put duplicate lines or lines starting with space in the history.
                            # See bash(1) for more options
                            HISTCONTROL=ignoreboth
                            
                            # append to the history file, don't overwrite it
                            shopt -s histappend
                            
                            # for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
                            HISTSIZE=1000
                            HISTFILESIZE=2000
                            
                            # check the window size after each command and, if necessary,
                            # update the values of LINES and COLUMNS.
                            shopt -s checkwinsize
                            
                            # If set, the pattern "**" used in a pathname expansion context will
                            # match all files and zero or more directories and subdirectories.
                            #shopt -s globstar
                            
                            # make less more friendly for non-text input files, see lesspipe(1)
                            #[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
                            
                            # set variable identifying the chroot you work in (used in the prompt below)
                            if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
                                debian_chroot=$(cat /etc/debian_chroot)
                            fi
                            
                            # set a fancy prompt (non-color, unless we know we "want" color)
                            case "$TERM" in
                                xterm-color|*-256color) color_prompt=yes;;
                            esac
                            
                            # uncomment for a colored prompt, if the terminal has the capability; turned
                            # off by default to not distract the user: the focus in a terminal window
                            # should be on the output of commands, not on the prompt
                            #force_color_prompt=yes
                            
                            if [ -n "$force_color_prompt" ]; then
                                if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
                                    # We have color support; assume it's compliant with Ecma-48
                                    # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
                                    # a case would tend to support setf rather than setaf.)
                                    color_prompt=yes
                                else
                                    color_prompt=
                                fi
                            fi
                            
                            if [ "$color_prompt" = yes ]; then
                                PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
                            else
                                PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
                            fi
                            unset color_prompt force_color_prompt
                            
                            # If this is an xterm set the title to user@host:dir
                            case "$TERM" in
                            xterm*|rxvt*)
                                PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
                                ;;
                            *)
                                ;;
                            esac
                            
                            # enable color support of ls and also add handy aliases
                            if [ -x /usr/bin/dircolors ]; then
                                test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
                                alias ls='ls --color=auto'
                                #alias dir='dir --color=auto'
                                #alias vdir='vdir --color=auto'
                            
                                #alias grep='grep --color=auto'
                                #alias fgrep='fgrep --color=auto'
                                #alias egrep='egrep --color=auto'
                            fi
                            
                            # colored GCC warnings and errors
                            #export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
                            
                            # some more ls aliases
                            #alias ll='ls -l'
                            #alias la='ls -A'
                            #alias l='ls -CF'
                            
                            # Alias definitions.
                            # You may want to put all your additions into a separate file like
                            # ~/.bash_aliases, instead of adding them here directly.
                            # See /usr/share/doc/bash-doc/examples in the bash-doc package.
                            
                            if [ -f ~/.bash_aliases ]; then
                                . ~/.bash_aliases
                            fi
                            
                            # enable programmable completion features (you don't need to enable
                            # this, if it's already enabled in /etc/bash.bashrc and /etc/profile
                            # sources /etc/bash.bashrc).
                            if ! shopt -oq posix; then
                              if [ -f /usr/share/bash-completion/bash_completion ]; then
                                . /usr/share/bash-completion/bash_completion
                              elif [ -f /etc/bash_completion ]; then
                                . /etc/bash_completion
                              fi
                            fi
                            # Set LS_COLORS environment by Deepin
                            if [[ ("$TERM" = *256color || "$TERM" = screen* || "$TERM" = xterm* ) && -f /etc/lscolor-256color ]]; then
                                eval $(dircolors -b /etc/lscolor-256color)
                            else
                                eval $(dircolors)
                            fi
                            
                            export QT_DEBUG_PLUGINS=1
                            export QT_QPA_PLATFORM_PLUGIN_PATH=/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms
                            sugon@EC:~$ source ~/.bashrc
                            sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
                            sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
                            qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" 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: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.
                            
                            Aborded
                            sugon@EC:~$ ldd ~/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/libqxcb.so 
                                    linux-vdso.so.1 (0x00007ffeb7df5000)
                                    libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6XcbQpa.so.6 (0x00007fd7162df000)
                                    libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007fd7162b0000)
                                    libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007fd71626e000)
                                    libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fd716267000)
                                    libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fd716261000)
                                    libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fd71625c000)
                                    libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fd716248000)
                                    libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fd716241000)
                                    libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fd71623c000)
                                    libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fd716232000)
                                    libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fd716228000)
                                    libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fd716219000)
                                    libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fd716212000)
                                    libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fd7161f4000)
                                    libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fd7161ca000)
                                    libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6OpenGL.so.6 (0x00007fd716128000)
                                    libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007fd7157a5000)
                                    libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007fd715711000)
                                    libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007fd7150ac000)
                                    libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fd7150a7000)
                                    libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007fd714f66000)
                                    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd714f61000)
                                    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd714f40000)
                                    libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd714dbc000)
                                    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd714c37000)
                                    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd714c1d000)
                                    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd714a5c000)
                                    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fd71493d000)
                                    libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fd714938000)
                                    libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007fd71492c000)
                                    libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007fd714927000)
                                    libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fd71491f000)
                                    libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007fd71490a000)
                                    libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fd7148c4000)
                                    libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007fd7147f2000)
                                    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd7147d5000)
                                    libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fd714719000)
                                    libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fd7146e5000)
                                    libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fd714628000)
                                    libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicui18n.so.56 (0x00007fd71418d000)
                                    libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicuuc.so.56 (0x00007fd713dd5000)
                                    libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicudata.so.56 (0x00007fd7123f2000)
                                    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fd7123e8000)
                                    /lib64/ld-linux-x86-64.so.2 (0x00007fd716397000)
                                    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fd712374000)
                                    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fd71235a000)
                                    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fd71231b000)
                                    libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fd712312000)
                                    libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007fd7122bf000)
                                    libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fd712286000)
                                    libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007fd712271000)
                                    libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fd7121ce000)
                                    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fd7121a6000)
                                    liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007fd712187000)
                                    libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fd712062000)
                                    libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fd71203f000)
                            sugon@EC:~$ 
                            
                            1 Reply Last reply
                            0
                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #135

                              Hi,

                              Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

                              By default you should not even need to use that variable.

                              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

                                Hi,

                                Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

                                By default you should not even need to use that variable.

                                M Offline
                                M Offline
                                mywings19
                                wrote on last edited by
                                #136

                                @SGaist
                                Me?That might be the problem

                                When I point the Qt plugin path, 'xcb' couldn't be found
                                sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
                                qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                                This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                Available platform plugins are: linuxfb, minimal, offscreen, vnc.

                                So shall I reinstall the Qt or add some plugins?
                                Thank you

                                1 Reply Last reply
                                0
                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #137

                                  Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

                                  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
                                  1
                                  • SGaistS SGaist

                                    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

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                                    mywings19
                                    wrote on last edited by mywings19
                                    #138

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

                                    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

                                    I've set the QT_DEBUG_PLUGINS environment variable in the .bashrc file and sourced it. See floor.134
                                    But these is no error message while loading qtcreator.

                                    sugon@EC:~$ echo $QT_DEBUG_PLUGINS
                                    1
                                    sugon@EC:~$

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                                    • hskoglundH Offline
                                      hskoglundH Offline
                                      hskoglund
                                      wrote on last edited by
                                      #139

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

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                                      • hskoglundH hskoglund

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

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                                        mywings19
                                        wrote on last edited by
                                        #140

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

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

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

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

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

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                                        • M mywings19

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

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

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

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

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

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

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

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

                                          In that case when does the message you showed earlier:

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

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

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