Exactly the same issue. Plasmashell segfault with "error 4 in libkcupslib.so". Black screen after login, all hot keys work, ALT+F2 works, but no desktop GUI. Removing "print-manager" fixed issue, but this is a hotfix.
My system (if helps): - Dell XPS 2-in-1 - Kubuntu 17.10 that was staying in my PC for last few months and that was initially grown up from Kubuntu 16.04. - Looks like the bug came in one of last updates. - First that I did when saw no GUI after reboot - upgraded to 18.04 with a hope, that upgrade will overwrite buggy pages. But the issue remained. - Cleaning up ".config" directory or creation of a new user does not work. New user accounts do not have GUI either. -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to plasma-workspace in Ubuntu. https://bugs.launchpad.net/bugs/1770044 Title: plasmashell crashes on login - so I can't use my desktop system. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1770044/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
