qt.qpa.plugin: Could not load the Qt platform plugin “xcb“ in
ubuntu18.04 遇到opencv无法保存问题：
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/xxx/miniconda3/envs/openmmlab/lib/python3.8/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)
最终把版本降低下来就好了，自动安装了一个4.6.0的
pip install opencv-python==4.1.2.30
尝试的解决方案，都没成功
//安装libxcb-xinerama0库
sudo apt-get install libxcb-xinerama0
//最终解决方法
pip3 uninstall opencv-python
pip3 install opencv-contrib-python
sudo apt-get install python3-opencv