I’m using the PPA version of Nextcloud Client on Ubuntu 22.04. After update to version 3.14.0-20240914.150754.d8fcb9273-1.0~jammy1 the client refused to start. On CLI the following error message was shown:
qt.qpa.plugin: Could not find the Qt platform plugin “xcb” in “”
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Of course reinstalling did not fix anything.
I found the solution on this page:
The reason for the problem is the switch from QT5 to QT6 (like Mixxx in the page above). There is a missing dependency in the PPA package:
sudo apt-get install qt6-qpa-plugins
This install fixes the problem.