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I recently ran a system update and the qt5-base package was updated to 5.15.0-2 and now every single QT application dies with a segmentation fault.
Because I don't use KDE or GNOME, I use qt5ct to configure the qt theme.
I also have the QT_QPA_PLATFORMTHEME environment variable set to "qt5ct".
I'm not sure what other QT configurations might affect applications like this so I don't know what other information to give.
Any help is appreciated!
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yeah, qt5ct has issues. See the bug tracker.
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Solution:
Back up your Qt5ct config:
$ mv ~/.config/qt5ct/qt5ct.conf ~/.config/qt5ct/qt5ct.conf.bck
Start qt5ct:
$ qt5ct
A configuration window should pop up. Choose your theme, icons, fonts etc. Click "Apply".
This should reset your appearance settings.
Start any Qt5 application, e.g.:
$ okular
Voilà, no segmentation fault, everything works with the 2020-06-07 release of the system.
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Usually this is due to you using a non repo qt5 theme that relies on qt's internal headers, did you rebuild whatever theme you are actively using against the new Qt?
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