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I have qt5ct installed. Normally this is not necessary, but I needed it for configuring the look of certain KDE apps. I noticed an error message when opening qt5ct:
QT_QPA_PLATFORMTHEME environment variable is not set (required value:qt5ct)
I had to change /etc/X11/Xsession.d/56xubuntu-session and comment out
export QT_QPA_PLATFORMTHEME=gtk2
Now the problem is solved and I can revert my workaround. Thank your for your help.
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