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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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  • 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

    M Offline
    M Offline
    mathsbloke
    wrote on last edited by
    #62

    @Srinivas-Reddy Many thanks, that got mine working too!

    1 Reply Last reply
    0
    • 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

      C Offline
      C Offline
      C0K01
      wrote on last edited by
      #63

      @Srinivas-Reddy Many thanks!

      1 Reply Last reply
      0
      • A Advig

        Tried reinstalling libxcb and worked for me as well.

        J Offline
        J Offline
        Jimit Rupani
        wrote on last edited by
        #64

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

        1. export QT_DEBUG_PLUGINS=1

        2. export PATH=$PATH:~/Qt/Tools/QtCreator/bin

        3. libxcb dependency so https://unix.stackexchange.com/questions/338519/how-to-install-libxcb gave the solution.

        sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

        1. sudo apt-get install libxkbcommon-x11-dev

        solved my problem for ubuntu 20.04. Tried reinstalling almost 3 times before the solution. Hope it helps someone

        A 1 Reply Last reply
        2
        • coffeesmokeC Offline
          coffeesmokeC Offline
          coffeesmoke
          wrote on last edited by
          #65

          So, Debian 10:

          1. ldd -r <for example, home dir>/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep libxcb-util

          libxcb-util.so.1 => not found

          1. Ok, continue...
            sudo find /usr/lib | grep libxcb-util
            ...
            libxcb-util.so.0.0.0
            libxcb-util.so.0.0
            libxcb-util.so.0
            , but need
            libxcb-util.so.1

          2. Ok, Debian... :) Redy?
            sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0.0
            sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0
            sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

          QtCreator start complete! :))))

          1 B N R 4 Replies Last reply
          8
          • S Offline
            S Offline
            stounhange7
            wrote on last edited by
            #66

            @coffeesmoke thanks for the help. you revived my qt on debian 10

            1 Reply Last reply
            0
            • coffeesmokeC coffeesmoke

              So, Debian 10:

              1. ldd -r <for example, home dir>/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep libxcb-util

              libxcb-util.so.1 => not found

              1. Ok, continue...
                sudo find /usr/lib | grep libxcb-util
                ...
                libxcb-util.so.0.0.0
                libxcb-util.so.0.0
                libxcb-util.so.0
                , but need
                libxcb-util.so.1

              2. Ok, Debian... :) Redy?
                sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0.0
                sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0
                sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

              QtCreator start complete! :))))

              1 Offline
              1 Offline
              1init
              wrote on last edited by 1init
              #67

              @coffeesmoke thank you for this i ran the debian 9 instructions after installing the updates and had this issue
              i run devuan

              1 Reply Last reply
              0
              • M Offline
                M Offline
                Malachi
                wrote on last edited by Malachi
                #68

                That symlink seems a little risky. Two worries:

                • What happens when the actual v1+ of the actual libxcb-util attempts to install?
                • Are you 100% sure Qt Creator isn't depending on a different API? Seems like a dice roll

                I admit though, it's better than nothing

                EDIT: A few minutes of browsing https://gitlab.freedesktop.org/xorg/lib/libxcb-util/-/blob/master/NEWS suggests that no API changes are there and that symlinking is probably API compliant in this case. Funny that Debian is 6 years behind on this lib. No judging. I know they gotta test stuff. Just funny :)

                S 1 Reply Last reply
                0
                • M Malachi

                  That symlink seems a little risky. Two worries:

                  • What happens when the actual v1+ of the actual libxcb-util attempts to install?
                  • Are you 100% sure Qt Creator isn't depending on a different API? Seems like a dice roll

                  I admit though, it's better than nothing

                  EDIT: A few minutes of browsing https://gitlab.freedesktop.org/xorg/lib/libxcb-util/-/blob/master/NEWS suggests that no API changes are there and that symlinking is probably API compliant in this case. Funny that Debian is 6 years behind on this lib. No judging. I know they gotta test stuff. Just funny :)

                  S Offline
                  S Offline
                  SlySven
                  wrote on last edited by
                  #69

                  Assuming that version 0 of something is a pre-first version release and that Devuan 3.0 "Beowulf" (systemd-less fork of Debian 10.0 "Buster") only has the 0.0.0 version then I guess symlinking the 0.0.0 to the 1.0.0 is the only chance we've got. I just got clobbered by this when running the Qt Creator updater from within the last version that was giving me Qt 5.15.1 that told me that there was an update available. It is a real PITA when it upgraded itself out of working...

                  ... however this topic has worked for me.

                  BTW The Devuan libxcb-util 0.0.0 version libraries do date back to 20 Aug 2014!

                  1 Reply Last reply
                  0
                  • coffeesmokeC coffeesmoke

                    So, Debian 10:

                    1. ldd -r <for example, home dir>/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep libxcb-util

                    libxcb-util.so.1 => not found

                    1. Ok, continue...
                      sudo find /usr/lib | grep libxcb-util
                      ...
                      libxcb-util.so.0.0.0
                      libxcb-util.so.0.0
                      libxcb-util.so.0
                      , but need
                      libxcb-util.so.1

                    2. Ok, Debian... :) Redy?
                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0.0
                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0
                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                    QtCreator start complete! :))))

                    B Offline
                    B Offline
                    beetree
                    wrote on last edited by
                    #70

                    @coffeesmoke

                    As for Debian. The correct library is found as of Debian 11. Which at the moment is in testing.

                    • Qt application fails to start on Debian 10 Buster because libqxcb.so requires missing libxcb-util.so.1

                    Symlink to a different library version is a possible workaround, but does not guarantee everything else works as expected, and as such ill advised.

                    coffeesmokeC 1 Reply Last reply
                    0
                    • S Offline
                      S Offline
                      saulesquivelg
                      wrote on last edited by
                      #71

                      I had the same problem after installing QT in Ubuntu 18.04, I've solved it with sudo apt install libxcp-xinerama0

                      1 Reply Last reply
                      0
                      • B beetree

                        @coffeesmoke

                        As for Debian. The correct library is found as of Debian 11. Which at the moment is in testing.

                        • Qt application fails to start on Debian 10 Buster because libqxcb.so requires missing libxcb-util.so.1

                        Symlink to a different library version is a possible workaround, but does not guarantee everything else works as expected, and as such ill advised.

                        coffeesmokeC Offline
                        coffeesmokeC Offline
                        coffeesmoke
                        wrote on last edited by
                        #72

                        @beetree I agree. Alternatively , a virtual machine. But if you do not want to install the VM, you need to save the changes in the notations to yourself to be able to return to the original version.

                        1 Reply Last reply
                        0
                        • J Jimit Rupani

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

                          1. export QT_DEBUG_PLUGINS=1

                          2. export PATH=$PATH:~/Qt/Tools/QtCreator/bin

                          3. libxcb dependency so https://unix.stackexchange.com/questions/338519/how-to-install-libxcb gave the solution.

                          sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

                          1. sudo apt-get install libxkbcommon-x11-dev

                          solved my problem for ubuntu 20.04. Tried reinstalling almost 3 times before the solution. Hope it helps someone

                          A Offline
                          A Offline
                          Alexreell
                          wrote on last edited by
                          #73

                          @Jimit-Rupani Thank you, the first 2 points on kali linux helped me

                          1 Reply Last reply
                          0
                          • coffeesmokeC coffeesmoke

                            So, Debian 10:

                            1. ldd -r <for example, home dir>/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep libxcb-util

                            libxcb-util.so.1 => not found

                            1. Ok, continue...
                              sudo find /usr/lib | grep libxcb-util
                              ...
                              libxcb-util.so.0.0.0
                              libxcb-util.so.0.0
                              libxcb-util.so.0
                              , but need
                              libxcb-util.so.1

                            2. Ok, Debian... :) Redy?
                              sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0.0
                              sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0
                              sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                            QtCreator start complete! :))))

                            N Offline
                            N Offline
                            Niffo
                            wrote on last edited by
                            #74

                            @coffeesmoke Thank you VERY much !

                            1 Reply Last reply
                            0
                            • 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

                              S Offline
                              S Offline
                              sheril
                              wrote on last edited by
                              #75

                              @Srinivas-Reddy
                              Thanks.

                              1 Reply Last reply
                              0
                              • 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!

                                R Offline
                                R Offline
                                requinham
                                wrote on last edited by
                                #76

                                @Lengendary Thanks, this resolve the problem for me on Ubuntu 18.04 Qt 5.15.2

                                Regards,
                                Mohamed Hamzaoui

                                C 1 Reply Last reply
                                0
                                • R requinham

                                  @Lengendary Thanks, this resolve the problem for me on Ubuntu 18.04 Qt 5.15.2

                                  C Offline
                                  C Offline
                                  CoreDump
                                  wrote on last edited by
                                  #77

                                  Environment: Ubuntu20.10; Qt 5.15.2, VirtualBox VM:

                                  The solution provided by @Legendary no longer works, use this instead:

                                  $ sudo apt-get install libxcb-randr0-dev libxcb-xtest0-dev libxcb-xinerama0-dev libxcb-shape0-dev libxcb-xkb-dev

                                  1 Reply Last reply
                                  0
                                  • coffeesmokeC coffeesmoke

                                    So, Debian 10:

                                    1. ldd -r <for example, home dir>/Qt/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so | grep libxcb-util

                                    libxcb-util.so.1 => not found

                                    1. Ok, continue...
                                      sudo find /usr/lib | grep libxcb-util
                                      ...
                                      libxcb-util.so.0.0.0
                                      libxcb-util.so.0.0
                                      libxcb-util.so.0
                                      , but need
                                      libxcb-util.so.1

                                    2. Ok, Debian... :) Redy?
                                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0.0
                                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1.0
                                      sudo ln -fs /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                                    QtCreator start complete! :))))

                                    R Offline
                                    R Offline
                                    roboTURx
                                    wrote on last edited by
                                    #78

                                    @coffeesmoke thanks a lot ~ this works for me

                                    1 Reply Last reply
                                    0
                                    • 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!

                                      D Offline
                                      D Offline
                                      Deep61803
                                      wrote on last edited by
                                      #79

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

                                      ibxcb-xinerama0

                                      Thank you, This solution helped me also.

                                      1 Reply Last reply
                                      0
                                      • T Offline
                                        T Offline
                                        trimixotun
                                        wrote on last edited by trimixotun
                                        #80

                                        It's looks slightly outdated, but maybe it someone helps:

                                        1. Debian 10 x86-64.
                                        2. LXDE
                                        3. Fresh net install Qt 5.12.10

                                        Qtcreator first launch problem: "qt.qpa.plugin: Could not load the Qt platform plugin "xcb"".

                                        Nothing from above helps at all. Qtcreator needs libxcb-util.so.1, but system has only libxcb-util.so.

                                        Simple solution:

                                        sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                                        All work, folks.

                                        W G 2 Replies Last reply
                                        1
                                        • T trimixotun

                                          It's looks slightly outdated, but maybe it someone helps:

                                          1. Debian 10 x86-64.
                                          2. LXDE
                                          3. Fresh net install Qt 5.12.10

                                          Qtcreator first launch problem: "qt.qpa.plugin: Could not load the Qt platform plugin "xcb"".

                                          Nothing from above helps at all. Qtcreator needs libxcb-util.so.1, but system has only libxcb-util.so.

                                          Simple solution:

                                          sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                                          All work, folks.

                                          W Offline
                                          W Offline
                                          wobl
                                          wrote on last edited by wobl
                                          #81

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

                                          sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                                          Thanks a lot ... this is working for MX Linux too - but with a little correction:

                                          sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so.0.0.0 /usr/lib/x86_64-linux-gnu/libxcb-util.so.1
                                          
                                          1 Reply Last reply
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