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

[jsulm]

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

i got same error,sir can you explain what is the error ?

Is X11 server running?

[StevenlAFl]

I got this error when loading a QT6 program that didn't ship the required QT6 plugins. Instead, the plugin package loaded was a QT5 one, so there was a mismatch.

apt-get install qt6-qpa-plugins will install the libqxcb.so file required along with libqeglfs.so, libqminimalegl.so, libqoffscreen.so, libqvnc.so, libqlinuxfb.so, libqminimal.so and libqvkkhrdisplay.so.

[ami01]

same error
trying to run autolabelimg on my local machine
github repo - https://github.com/wufan-tb/AutoLabelImg

while doing the same the error I am getting continuously while trying to open the software is -
(ano) workstation@workstation-HP-Z4-G4-Workstation:~/AutoLabelImg$ python labelImg.py
QObject::moveToThread: Current thread (0x5616f4c8c8c0) is not the object's thread (0x5616f9c826f0).
Cannot move to target thread (0x5616f4c8c8c0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

Aborted (core dumped)

have tried reinstalling libxcb, i have tried export Qt platform plugin set command also, have tried the famous sudo apt-get install libxcb-xinerama0 command also, nothing is helping

using ubuntu 20.04, can someone please help

[jsulm]

@ami01 You should really use the search function in this forum. This is asked very often.
To debug plug-in problems like yours do: set QT_DEBUG_PLUGINS env variable before ruinning your app, then inspect (or post here) its output. See https://doc.qt.io/qt-6/debug.html for details.

[jsulm]

@ami01 I laready provided this information to you here: https://forum.qt.io/topic/148718/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found/6
Did you actually try that? If not - why?

[ami01]

@jsulm
I did try and now my terminal is showing the message -
(ano) workstation@workstation-HP-Z4-G4-Workstation:~/AutoLabelImg$ python labelImg.py
QFactoryLoader::QFactoryLoader() checking directory path "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/workstation/anaconda3/envs/ano/bin" ...
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/2to3"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/2to3-3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/2to3-3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/2to3-3.7"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/2to3-3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/2to3-3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/c_rehash"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/c_rehash' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/c_rehash' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/captoinfo"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tic'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/clear"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/clear'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/convert-caffe2-to-onnx"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/convert-caffe2-to-onnx' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/convert-caffe2-to-onnx' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/convert-onnx-to-caffe2"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/convert-onnx-to-caffe2' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/convert-onnx-to-caffe2' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/f2py"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/f2py' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/f2py' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/f2py3"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/f2py3' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/f2py3' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/f2py3.7"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/f2py3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/f2py3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/fonttools"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/fonttools' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/fonttools' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/idle3"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/idle3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/idle3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/idle3.7"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/idle3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/idle3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/imageio_download_bin"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/imageio_download_bin' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/imageio_download_bin' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/imageio_remove_bin"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/imageio_remove_bin' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/imageio_remove_bin' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/infocmp"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/infocmp'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/infotocap"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tic'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lsm2bin"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/lsm2bin' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/lsm2bin' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzcat"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzcmp"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzdiff"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzegrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzfgrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzgrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzless"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzless' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzless' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzma"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzmadec"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/lzmadec'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzmainfo"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/lzmainfo'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/lzmore"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzmore' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzmore' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/natsort"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/natsort' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/natsort' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/ncursesw6-config"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/ncursesw6-config' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/ncursesw6-config' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/normalizer"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/normalizer' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/normalizer' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/openssl"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/openssl'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pip"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pip' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pip' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pip3"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pip3' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pip3' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pydoc"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pydoc3"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pydoc3.7"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pydoc3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyftmerge"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyftmerge' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyftmerge' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyftsubset"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyftsubset' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyftsubset' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pylupdate5"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pylupdate5' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pylupdate5' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyrcc5"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyrcc5' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyrcc5' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/python3.7'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/python3.7'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3-config"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3.7"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/python3.7'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3.7-config"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3.7m"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/python3.7'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/python3.7m-config"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/python3.7m-config' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyuic5"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyuic5' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyuic5' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyvenv"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyvenv-3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyvenv-3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/pyvenv-3.7"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/pyvenv-3.7' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/pyvenv-3.7' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/reset"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tset'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/skivi"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/skivi' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/skivi' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/sqlite3"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/sqlite3'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/sqlite3_analyzer"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/sqlite3_analyzer' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/sqlite3_analyzer' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tabs"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tabs'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tclsh"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tclsh8.6'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tclsh8.6"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tclsh8.6'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tic"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tic'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tiff2fsspec"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/tiff2fsspec' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/tiff2fsspec' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tiffcomment"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/tiffcomment' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/tiffcomment' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tifffile"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/tifffile' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/tifffile' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/toe"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/toe'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/torchrun"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/torchrun' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/torchrun' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tput"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tput'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tqdm"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/tqdm' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/tqdm' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/tset"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/tset'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/ttx"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/ttx' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/ttx' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/unlzma"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/unxz"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/wheel"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/wheel' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/wheel' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/wish"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/wish8.6'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/wish8.6"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/wish8.6'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/x86_64-conda-linux-gnu-ld"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/x86_64-conda-linux-gnu-ld'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/x86_64-conda_cos7-linux-gnu-ld"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/x86_64-conda-linux-gnu-ld'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xz"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzcat"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xz'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzcmp"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzdec"
"Failed to extract plugin meta data from '/home/workstation/anaconda3/envs/ano/bin/xzdec'"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzdiff"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzdiff' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzegrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzfgrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzgrep"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzgrep' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzless"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzless' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzless' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/bin/xzmore"
QElfParser: '/home/workstation/anaconda3/envs/ano/bin/xzmore' is not an ELF object
"'/home/workstation/anaconda3/envs/ano/bin/xzmore' is not an ELF object"
not a plugin
QFactoryLoader::QFactoryLoader() checking directory path "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqvnc.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/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 "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqwebgl.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/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() looking at "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /home/workstation/anaconda3/envs/ano/lib/python3.7/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 "/home/workstation/anaconda3/envs/ano/bin/platforms" ...
loaded library "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
QObject::moveToThread: Current thread (0x5623c38ef7c0) is not the object's thread (0x5623c310ff40).
Cannot move to target thread (0x5623c38ef7c0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

Aborted (core dumped)
(ano) workstation@workstation-HP-Z4-G4-Workstation:~/AutoLabelImg$

[jsulm]

@ami01 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

loaded library "/home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
QObject::moveToThread: Current thread (0x5623c38ef7c0) is not the object's thread (0x5623c310ff40).
Cannot move to target thread (0x5623c38ef7c0)

Not clear what is being moved to another thread here.
Is /home/workstation/anaconda3/envs/ano/lib/python3.7/site-packages/cv2/qt the Qt installation you want to use?

[ami01]

@jsulm yes

[agguro]

a bit late but for future use and reference. followed the ldd on the plugin and libxcursor.so wasn't found. My solution:
sudo apt install libxcb-*
and it works (Qt6 already)

[IanH222]

I have this problem and sudo apt install libxcb-* did not help:

I tried putting all of the dump in but was told it was spam, so what do you need apart from

Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
loaded library "/home/ian/.local/lib/python3.10/site-packages/cv2/qt/plugins/platforms/libqxcb.so"
QObject::moveToThread: Current thread (0x5ec7f263a1c0) is not the object's thread (0x5ec7e82491a0).
Cannot move to target thread (0x5ec7f263a1c0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/ian/.local/lib/python3.10/site-packages/cv2/qt/plugins" 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.

[JonB]

@IanH222 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

QObject::moveToThread: Current thread (0x5ec7f263a1c0) is not the object's thread (0x5ec7e82491a0).
Cannot move to target thread (0x5ec7f263a1c0)

We don't know why you are getting this. Let's start with: are you using any threads, or is there anything "funny" about your Qt application?

[IanH222]

It's loaded as part of a python script, and the problem is in matplotlib code.

It looks like it's potentially a problem with PyTorch's DataLoader using threads, and then me asking matplotlib to imshow some data that was originally loaded on a different thread. But I can't go much deeper than that because the rest is all in libraries.

[JonB]

@IanH222
I know that you must not try to do any Qt UI stuff in anything but the main thread, but I don't know how that relates to whatever you are doing in matplotlib.

[IanH222]

Thanks, appreciate the help. I'll ask in the forum for this code snippet.