qt.qpa.plugin: Could not load the Qt platform plugin "xcb" on Linux

[aymennasri]

I keep getting a Qt platform plugin found but not loaded error, i tried everything from using a virtual env to installing it on my system.

[GreatV]

please refer to https://stackoverflow.com/questions/41994485/how-to-fix-could-not-find-or-load-the-qt-platform-plugin-windows-while-using-m

[aymennasri]

this is the error, what you just sent me is related to windows

/home/aymen/.local/lib/python3.12/site-packages/paddle/utils/cpp_extension/extension_utils.py:711: UserWarning: No ccache found. Please be aware that recompiling all source files may be required. You can download and install ccache from: https://github.com/ccache/ccache/blob/master/doc/INSTALL.md
  warnings.warn(warning_message)
QObject::moveToThread: Current thread (0x62cfc90) is not the object's thread (0xc037b20).
Cannot move to target thread (0x62cfc90)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/aymen/.local/lib/python3.12/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.



--------------------------------------
C++ Traceback (most recent call last):
--------------------------------------
No stack trace in paddle, may be caused by external reasons.

----------------------
Error Message Summary:
----------------------
FatalError: `Process abort signal` is detected by the operating system.
  [TimeInfo: *** Aborted at 1749385843 (unix time) try "date -d @1749385843" if you are using GNU date ***]
  [SignalInfo: *** SIGABRT (@0x3e80000be26) received by PID 48678 (TID 0x7942cfd81080) from PID 48678 ***]

Aborted (core dumped)```

[GreatV]

• qt.qpa.plugin: Could not load the Qt platform plugin "xcb" #26

[aymennasri]

Did you build this tool to be used and installed inside a virtual env or directly in the system? Because i'm using uv to set it up?

[GreatV]

@aymennasri I use venv, and it works. This is a QT-related issue—you can search for related issues online. Also, uv might not support the Paddle framework yet.

[aymennasri]

Alright then, thanks for the instant replies and help!

[aymennasri]

For anyone wondering about the solution, installing opencv-python-headless solves the problem.