Ubuntu 12.10 64 bits with Unity.
When I restart or shutdown the PC, it takes too long to do it.
It shows the line
Asking all remaining processes to terminate... [fail] and after
Killing all remaining processes.
How can I debug this to determine the origin of the problem?
I had the same problem with Ubuntu 13.04 running virtual in VMware player. I tried Ctrl + Alt + T (I didn't expect a console and it doesn't show any), and all the sudden the installation continues!
I already tried Esc, Ctrl + C, Ctrl + break, but this had no effect.
I was experiencing the same behaviour when using a NAS (samba share) with fixed mounting points. It was caused by some kind of race condition between the unmounting process and network-manager during termination stage on shutdown. Here's a small workaround that fixed it for me:
Fire up a terminal by pressing Ctrl + Alt + T and paste these commands:
This simply moves the unmounting process up the priority list when shutting down or rebooting the system. At least my system is shutting down very fast again without errors.