The solution presented here: http://askubuntu.com/questions/452750 /reboot-after-shutdown-ubuntu-14-04-also-12-04-dell-latitude-e7440 was found by an observant colleague and did the trick for me. After disabling wake-on-(Lan/USB) the error seems gone.
Tested on 3.16.0-50 Trusty on a HP EliteBook 840 Laptop. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1346269 Title: Ubuntu 14.04 won't shut down (reboots) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346269/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs