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I've been using 10.10 on my notebook for about a week, as it started to behave like this: Sometimes, while booting (while the "Ubuntu"-picture is showing, the one with the 4 dots representing the progress bar ), it shows " ######.#### restarting system", where #'s are "random" numbers followed by a reboot. I thought it could have something to do with usb-devices (I thought I've read something like that somewhere), so I tried unplugging - which didn't improve anything. Does anyone have a clue in which direction I should dig? Google is no big help for me here, because I'm kinda lacking good keywords.

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Press Shift when the BIOS has finished initializing the keyboard and hold it down until the Grub menu appears. At the menu, edit the first “Ubuntu …” entry, edit the linux line to remove the words quiet and splash, and boot. This will show verbose error messages. Report the last few messages. –  Gilles Nov 22 '10 at 22:56

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IIRC, typing escape during boot will give you something a lot more verbose. Try to catch what happens before the reboot. Alternatively, the system logs in /var/log/syslog, if you look for the time before the last reboot, should have some info.

Edit, wild guess: maybe you are dual-booting, the other OS tells the bios it is doing a reboot, no one clears that, ubuntu see the "reboot" flag, interprets it differently and reboots.

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I read the syslog - and I can't find any difference between the failed systemboot and the ones before that. 'pulseaudio' and 'vpnagent' are being started, followed by the logs from the new boot (after the restart) - w/o any clue to errors or anything :/ –  user56535 Nov 22 '10 at 22:51
    
I in fact have XP installed, so this really might be the cause - is there anything I could do about it? –  user56535 Nov 24 '10 at 10:23

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