qt.qpa.plugin could not load qt¶

Here is an error message that you might encounter when using OpenCV with Qt on Linux:

qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/kc/Desktop/projects/pretty/venv/lib/python3.11/site-packages/cv2/qt/plugins" even though it was found.

This appplication failed to start because no Qt platform plugin could be initialized. Also, the error indicates that the Qt platform plugin xcb is missing or not properly configured. This is often required by libraries like OpenCV when using GUI features. Here's how to resolve the issue:

# Install the necessary libraries for the `xcb` plugin
sudo apt update
sudo apt install -y libxcb-cursor0 libxcb-xinerama0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-render-util0