@ Stefan I won't count my chickens before they hatch ... but removing the nvidia driver seems to solve the problem. I started and restarted my notebook very often after switching to the generic driver.
I can't believe it. I will keep on testing. And I also will test new drivers. But so far: THANK YOU! -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/987220 Title: System does not power off reliably when "Shut Down" chosen from GUI To manage notifications about this bug go to: https://bugs.launchpad.net/indicator-session/+bug/987220/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs