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I upgraded from 14.04 to 14.10 recently. The laptop does not shut down properly anymore. It used to take only 3-5 sec to shutdown in 14.04. But now it needs ca. 5 min to shut down after sleep. If it never slept, then shut down process is normal. The message on the shut down screen has something to do with ModemManager:

ModemManager: ModemManager is shut down

ModemManager: Could not acquire the 'org.freedesktop.ModemManager1' service name

it stays like that for ca. 5 min before it suddenly shuts down.

I added stop on runlevel [06] to the network-manager.conf file. It did not help. I used shutdown -h now. It did not help.

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I solved the problem by editing both /etc/init/modemmanager.conf and /etc/init/network-manager.conf via adding a line to them:

kill timeout 1
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