I'm not sure that the crash happens when there are are some windows open. I tried and it is not so for me. I tried with an other user, and same issue. I solved this problem with purge kubuntu-default-settings If reinstall this package the issue returns
-- knotify4 crashes while system turn off https://bugs.launchpad.net/bugs/290083 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kdebase-runtime in ubuntu. -- kubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
