This application failed to start because no Qt platform plugin could be initialized

[haithienld]

Provide environment information

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/pidl/.local/lib/python3.9/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.

What OS are you using?

Ubuntu 20.04

Describe the Bug

When I run labelme Folder. The bug happens

Expected Behavior

No response

To Reproduce

No response

[haithienld]

I fixed it.
After deleting all in the /home/pidl/.local/lib/python3.9/site-packages/cv2/qt/plugins folder that the bug still happens.
Please install. (with opencv-4.4)
sudo apt-get install qt5-default

[amaizr]

was able to work around this using this answer: NVlabs/instant-ngp#300 (comment)

[kaiesalmahmud]

I was facing the same issue. Turns out in my case, python 3.9 was causing this conflict.
I managed to solve this by creating a new environment with python 3.8.

commands:
conda create -n myenv python=3.8.0
conda activate myenv
pip3 install opencv-python==4.2.0.34

[a-pijpaert]

For me it worked to downgrade PyQt5 to version 5.13.2.

I am on Python version 3.10.6 and opencv-python version 4.7.0.72.

[bryanbocao]

pip install --upgrade pyqt5_tools

solved my issue.
Reference
https://github.com/fmjohnson97/habitat_heuristic/issues/2#issuecomment-1751440118

[kimkimyoung]

pip install opencv-python-headless

It works for me in a conda env

[sc0v0ne]

Use brew, which avoids these errors. On Ubuntu brew works.

brew install pyqt 
brew install wkentaro/labelme/labelme  # command line interface

[Jie-Huangi]

pip install opencv-python-headless

It works for me in a conda env
also sloved my issue, thanks.

[Satyam-Vy]

pip install opencv-python-headless

It works for me in a conda env

worked for me to solve anaconda-navigator launch issue! thanks!!

[mzohaibnasir]

pip install opencv-python-headless
It works for me in a conda env

worked for me to solve anaconda-navigator launch issue! thanks!!

that didn't work but
upgrading openv did the job for me
pip install opencv-python --upgrade

[Troye5585]

New system ubuntu 20.04, first time installing labelImg with a bug:
(labelimg) user@sf-purechip-gpu:~$ labelImg
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.

已放弃 (核心已转储)
Solution Methods
1：export QT_DEBUG_PLUGINS=1
2：get the response: Cannot load library /home/user/anaconda3/envs/labelimg/lib/python3.8/site-packages/PyQt5/Qt5/plugins/platforms/libqxcb.so: (libxcb-xinerama.so.0: 无法打开共享对象文件: 没有那个文件或目录)
3: run in dir /home/user/anaconda3/envs/labelimg/lib/python3.8/site-packages/PyQt5/Qt5/plugins/platforms/ "ldd libqxcb.so" to get "libxcb-xinerama.so.0 => not found"
4: sudo apt-get install libxcb-xinerama0
5: labelImg
6: OK
refer to: https://cloud.tencent.com/developer/article/1726400