Just chiming in to say that opensense's solution above also fixed it for me. I created /etc/lightdm/lightdm.conf and put in it:
[SeatDefaults] user-session=plasma and it worked to fix the "Failed to start session" error in the greeter after entering my password. -- 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/1629543 Title: KDE does not start when using lightdm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1629543/+subscriptions -- kubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
