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I'm having problems restarting or turning of ubuntu 10.10 on a samsung r560. I had no problems with previous ubuntu versions.

When turning off, ubuntu stays forever in the purple screen with 4 dots. When restartig, I get

init: Disconnectded from system bus
init: dbus main process (752) killed by TERM signal

nm-dispatcher.action: Cought signal 15, shutting down...
modem-manager: Cought signal 15, shutting down...

The laptop does not shut down after this.

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tried sudo reboot, did not help. this time I got stuck on the back screen that says ubuntu 10.10 and displays .... under it. – varsketiz Nov 26 '10 at 17:06
Have you tried sudo halt ? – karthick87 Nov 26 '10 at 18:30
Do you have any mapped network drives in your /etc/fstab? If so, and you connect to those via WIFI, this is a known bug (but usually also results in a CIFS error, which I don't see in your output). – Scaine Nov 26 '10 at 20:12
I deleted all mapped drives from /etc/fstab but its still the same. I connect to internet via wifi, but I do not connect to any devices this way. I usually have an external hdd attached (usb) + mouse (usb), but I tried without it, same problem. Also, the output is not always like this. Its different every time. One thing I noticed is that if I press "escape", I get to black screen with blinking _ at the top. if I press escape one more time I get to the purple ubuntu screen again. – varsketiz Jan 16 '11 at 21:30

Do you have an external storage device installed on the computer? Try removing first before shutting down.

I found this Not sure if it applies to your situation. This one is a wireless issue.

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Thanks you your attempts, but these suggestions did not drive me to the solution to this problem. Is there any log (or can I set up one) for what goes on on this shutdown command? – varsketiz Jan 16 '11 at 20:58

In terminal type sudo reboot or sudo halt to halt your system

For shutting down instantly,

sudo shutdown -P now or sudo poweroff or sudo su && init 0

Also See this thread

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up vote 1 down vote accepted

my issue was that rabbit-mq server was stopping me from restarting. so to actually halt I need to

sudo service rabbitmq-server stop
sudo halt

I just made an alias for it while this issue is fixed.

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