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Whenever I shutdown or reboot, there is a very long delay (several minutes) before the system will shutdown. I was getting a nm-dispatch signal 15 so I thought the problem might be with network manager. I purged network manager but it didn't help.

The message I get while shutting down is "killing all remaining processes... [fail]" with no further information.

If I don't hit up-arrow right away, I get the Ubuntu logo dots screen and they all remain white.

There is nothing in /var/crash

Things I've tried:

What can I do? How can I tell what is causing the hangup?

Update: I just did a fresh install, and this problem happens on the first reboot after the install.

share|improve this question
The "killing all remaining processes... [fail]" still happens even after reinstallation? – Braiam Jan 10 '14 at 2:05
Related: 13.10 Shutdown/Restart issue – Eliah Kagan Jan 10 '14 at 2:08
Braiam: Yes immediately upon the first reboot where you have to remove the installation media. It also says "modem manager caught signal 15 shutting down. – MikeJerome Jan 10 '14 at 2:09
Could this be bug 1066484 or bug 1024868? – Eliah Kagan Jan 10 '14 at 2:22
My system is a Lenovo W700 which doesn't seem to be a supported Ubuntu model. Maybe this is causing some problems? – MikeJerome Jan 10 '14 at 2:34

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