This happened to me too about a 2 months ago: I installed Ubuntu 16.04. Then I installed the graphic driver (nvidia-367) about a month ago.
Everything was OK until 21 September 2016. I think that the linux image update that I downloaded at 21 Sep (according to the update history file) totally ruined everything.. The error message in "dmesg" was: "NMI watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [nvidia-persiste ..." It happened on startup. But a significant delay was present *also* when shutting down. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1530405 Title: NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kerneloops:814] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530405/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
