NormCap-0.4.3-x86_64.AppImage crashs - could not load the qt platform plugin

[MInessota]

What happened?

NormCap-0.4.3-x86_64.AppImage is not working.

How did you install NormCap?

AppImage (Linux)

Operating System + Version?

Linux Mint 20.3

[Linux only] Display Server (DS) + Desktop environment (DE)?

e.g. DS: Xorg DE: Cinnamon

Debug log output?

./NormCap-0.4.3-x86_64.AppImage -v debug

18:25:48 - INFO    - normcap:30 - Start NormCap v0.4.3
18:25:48 - ERROR   - normcap:214 - [QT] qtinfomsg - could not load the qt platform plugin "xcb" in "" even though it was found.
18:25:48 - ERROR   - normcap:219 - Try solving the problem as described here: ('https://github.com/dynobo/normcap/blob/main/FAQ.md#linux-could-not-load-the-qt-platform-plugin-xcb',)
18:25:48 - ERROR   - normcap:220 - If that doesn't help, please open an issue: https://github.com/dynobo/normcap/issues
18:25:48 - ERROR   - normcap:214 - [QT] qtfatalmsg - this application failed to start because no qt platform plugin could be initialized. reinstalling the application may fix this problem.

available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vkkhrdisplay, vnc, wayland-egl, wayland, xcb.

/tmp/.mount_NormCaxgqKwZ/AppRun, line 11: 43739 Aborted (core image saved) "${APPDIR}/usr/python/bin/python3" -u -s -X utf8 -c "import runpy, sys; sys. path.pop(0); runpy.run_module('${BRIEFCASE_MAIN_MODULE}', run_name='__main__', alter_sys=True)" "$@"

[dynobo]

Can reproduce on LinuxMint 20.3, and I wouldn't be surprised if every distro based on Ubuntu 20.04 is affected.
I strongly suspect 4b6e20c , which updates PySide6 (the QT Python bindings) from 6.4.2 to 6.5.1.

Investigating...

[dynobo]

Seems like Qt 6.5 requires Ubuntu 22.04+, while Qt 6.4 was happy with Ubuntu 20.04+.

I'm trying to find out, if adding or updating some build or runtime dependencies might help...

[dynobo]

@MInessota, a workaround seems to be to install an additional dependency:

sudo apt install libxcb-cursor0

Can you please confirm, that this works for you, too?

Notes to myself:

• Investigate if libxcb-cursor0 can be included in the AppImage
• Check if this dependency needs to be added somewhere else, too.

[MInessota]

Hi dynobo,

It worked installing libxcb-cursor0 (^o^)//

Thank you very much, your program is very good and useful, I use it a lot, it is simple and very practical to use!!!

[sojusnik]

Had the same error message when upgrading with pip install normcap --upgrade to 0.4.4 on Ubuntu 22.10.

sudo apt install libxcb-cursor0 helped in this case.