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I have Ubuntu 13.04 on a Lenovo Thinkpad SL510. Since upgrading to 13.04, the computer hangs on the Ubuntu loading screen (the changing white and orange dots) when rebooting. Turning on and off however works fine.

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You should try this again, then copy syslog and dmesg.0 (dmesg is the log from the current session, dmesg.0 from the one before) from /var/log to wherever you want and inspect them. Please add the last lines the system hangs on to your question. – labsin May 20 '13 at 20:26

I have this issue on 5 different 13.04 systems they all get stuck in run level 1 if you use sudo reboot now, this is a serious issue, I don't want to have to physically reboot all remote servers I manage.

The solution is to use sudo shutdown -r now which works and reboots.

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