qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/"
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Installation and Deployment
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Hello trying to build and run an application in Qt creator. I have built qt5.15.13 from source and installed qtcreator using installer. I am getting following error , the plugin flag=1 already.
22:41:31: Starting /home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/ETheme... QML debugging is enabled. Only use this in a safe environment. QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" ... QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "eglfs" ] }, "archreq": 0, "className": "QEglFSIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("eglfs") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "linuxfb" ] }, "archreq": 0, "className": "QLinuxFbIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("linuxfb") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "minimal" ] }, "archreq": 0, "className": "QMinimalIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("minimal") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "minimalegl" ] }, "archreq": 0, "className": "QMinimalEglIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("minimalegl") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "offscreen" ] }, "archreq": 0, "className": "QOffscreenIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("offscreen") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqvnc.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "vnc" ] }, "archreq": 0, "className": "QVncIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("vnc") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-egl.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-egl.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "wayland-egl" ] }, "archreq": 0, "className": "QWaylandEglPlatformIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("wayland-egl") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-generic.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-generic.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "wayland" ] }, "archreq": 0, "className": "QWaylandIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("wayland") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-xcomposite-egl.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-xcomposite-egl.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "wayland-xcomposite-egl" ] }, "archreq": 0, "className": "QWaylandXCompositeEglPlatformIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("wayland-xcomposite-egl") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-xcomposite-glx.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-xcomposite-glx.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "wayland-xcomposite-glx" ] }, "archreq": 0, "className": "QWaylandXCompositeGlxPlatformIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("wayland-xcomposite-glx") QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so" Found metadata in lib /usr/lib/x86_64-linux-gnu/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/local/Qt-5.15.13/plugins" ... QFactoryLoader::QFactoryLoader() checking directory path "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug" ... QFactoryLoader::QFactoryLoader() looking at "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/ETheme" "Failed to extract plugin meta data from '/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/ETheme'" not a plugin QFactoryLoader::QFactoryLoader() looking at "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/main.o" "Failed to extract plugin meta data from '/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/main.o'" not a plugin QFactoryLoader::QFactoryLoader() looking at "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/Makefile" QElfParser: '/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/Makefile' is not an ELF object "'/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/Makefile' is not an ELF object" not a plugin QFactoryLoader::QFactoryLoader() looking at "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/qrc_qml.cpp" QElfParser: '/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/qrc_qml.cpp' is not an ELF object "'/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/qrc_qml.cpp' is not an ELF object" not a plugin QFactoryLoader::QFactoryLoader() looking at "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/qrc_qml.o" "Failed to extract plugin meta data from '/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/qrc_qml.o'" not a plugin QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/platforms" ... QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/Qt-5.15.13/plugins/platforms" ... QFactoryLoader::QFactoryLoader() looking at "/usr/local/Qt-5.15.13/plugins/platforms/libqlinuxfb.so" Found metadata in lib /usr/local/Qt-5.15.13/plugins/platforms/libqlinuxfb.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "linuxfb" ] }, "archreq": 0, "className": "QLinuxFbIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("linuxfb") QFactoryLoader::QFactoryLoader() looking at "/usr/local/Qt-5.15.13/plugins/platforms/libqminimal.so" Found metadata in lib /usr/local/Qt-5.15.13/plugins/platforms/libqminimal.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "minimal" ] }, "archreq": 0, "className": "QMinimalIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("minimal") QFactoryLoader::QFactoryLoader() looking at "/usr/local/Qt-5.15.13/plugins/platforms/libqoffscreen.so" Found metadata in lib /usr/local/Qt-5.15.13/plugins/platforms/libqoffscreen.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "offscreen" ] }, "archreq": 0, "className": "QOffscreenIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("offscreen") QFactoryLoader::QFactoryLoader() looking at "/usr/local/Qt-5.15.13/plugins/platforms/libqvnc.so" Found metadata in lib /usr/local/Qt-5.15.13/plugins/platforms/libqvnc.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "vnc" ] }, "archreq": 0, "className": "QVncIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("vnc") QFactoryLoader::QFactoryLoader() looking at "/usr/local/Qt-5.15.13/plugins/platforms/libqwebgl.so" Found metadata in lib /usr/local/Qt-5.15.13/plugins/platforms/libqwebgl.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "webgl" ] }, "archreq": 0, "className": "QWebGLIntegrationPlugin", "debug": false, "version": 331520 } Got keys from plugin meta data ("webgl") QFactoryLoader::QFactoryLoader() checking directory path "/home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/platforms" ... Cannot load library /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so: (/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: undefined symbol: _ZN23QPlatformVulkanInstance22presentAboutToBeQueuedEP7QWindow, version Qt_5_PRIVATE_API) QLibraryPrivate::loadPlugin failed on "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so" : "Cannot load library /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so: (/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: undefined symbol: _ZN23QPlatformVulkanInstance22presentAboutToBeQueuedEP7QWindow, version Qt_5_PRIVATE_API)" qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/usr/lib/x86_64-linux-gnu/qt5/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: eglfs (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), linuxfb (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), minimal (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), minimalegl (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), offscreen (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), vnc (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), wayland-egl (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), wayland (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), wayland-xcomposite-egl (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), wayland-xcomposite-glx (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), xcb (from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/), linuxfb, minimal, offscreen, vnc, webgl. 22:41:32: /home/nightmare/Projects/qt_projects/E-Scooty-Dashboard-/build/qt5_15-Debug/ETheme crashed.when i do which libqxcb.so
/home/nightmare/.local/lib/python3.6/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so /home/nightmare/Qt/QtCreator/Tools/QtCreator/lib/Qt/plugins/platforms/libqxcb.so /home/nightmare/pyqt_learn/projects/venv/lib/python3.10/site-packages/PyQt6/Qt6/plugins/platforms/libqxcb.so /snap/mame/4278/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so /snap/retroarch/2648/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.sothanks
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Hi,
You seem to have quite a lot of stuff there.
Do you have LD_LIBRARY_PATH modified ?
Are you using the Qt version from your distribution or a different one that you built yourself ?
Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
@SGaist Hi o/
I am using qt-everywhere from official website : https://download.qt.io/archive/qt/5.15/5.15.13/single/
built on ubuntu 22.04 when I used "./configure" i got following tooNote: The following modules are not being compiled in this configuration: webenginecore webengine webenginewidgets pdf pdfwidgets WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation. Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation. On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution. On macOS, you can use Homebrew's llvm package. On Windows, you must set LLVM_INSTALL_DIR to the installation path. WARNING: Tool bison is required to build QtWebEngine. WARNING: Tool bison is required to build QtPdf. WARNING: QtWebEngine will not be built. WARNING: QtPdf will not be built. Qt is now configured for building. Just run 'gmake'. Once everything is built, you must run 'gmake install'. Qt will be installed into '/usr/local/Qt-5.15.13'. Prior to reconfiguration, make sure you remove any leftovers from the previous build.I don't think this is affecting my issue anyway. I am only using these additional environment variables in QtCreator
QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/ QT_DEBUG_PLUGINS=1now regarding LD_LIBRARY_PATH , I don't think I have set it anywhere or modified it. It's not set in my .bashrc or .profile atleast
thanks :)
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Hi, looks like you have two versions of Qt5 installed:
the default Qt5 one (from the Ubuntu 22.04 distribution
Qt 5.15.3 downloaded from QtYou're running an app using 5.15.3 but because you've set QT_QPA_PLATFORM_PLUGIN_PATH to the default Qt version which I think lacks support for OpenGl, which is way to xcb plugin from the default Qt fails to load.
Try either removing that QT_QPA_PLATFORM_PLUGIN_PATH env setting, or upgrade the default Qt so that it supports OpenGL (as the 5.15.3 version does) say something like this:
sudo apt remove qt5-default-dev
sudo apt install libqt5opengl5-dev
