KDE Plasma has sometimes the bad habit to not allow users to logout/reboot/poweroff just after a Plasma update has been runned. For example I have just updated from 5.20.1 to 5.20.2 and I am not able to logout in order to login again and use the new Plasma version. I would not like to use reboot command from bash since I am not sure it would terminate KDE processes gently
Openend a new bugreport with more details and a more accurate component *** This bug has been marked as a duplicate of bug 429185 ***