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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.

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The "killing all remaining processes... [fail]" still happens even after reinstallation? –  Braiam Jan 10 at 2:05
    
Related: 13.10 Shutdown/Restart issue –  Eliah Kagan Jan 10 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 at 2:09
    
Could this be bug 1066484 or bug 1024868? –  Eliah Kagan Jan 10 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 at 2:34
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