qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/anaconda3/envs/yolov5/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.

报错原因：OpenCV与Qt的兼容性问题，如果程序使用了OpenCV（如Python的cv2），其内置的Qt可能与系统Qt版本冲突。

解决方法：

# 重新安装OpenCV（避免携带Qt插件）
pip uninstall opencv-python opencv-python-headless
pip install opencv-python-headless  # 无Qt依赖的版本

卸载重新安装无qt以来版本的opencv库后，qt界面可以正常运行，无报错显示。