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I would like to remotely reboot my Ubuntu 12.04 LTS server via ssh. I do sudo reboot and I loose connection and the server connection does not reappear. It does not ping.

When I go the the physical computer with a screen attached I see a black screen and hear that the server is still on. I do a hard power off (press power on button for a few seconds) and the server halts. After I press power on the server boots with no problem.

As far as I remember the remote reboot has previously worked on that server.

I wonder if sudo reboot & will help? I suppose I could also try sudo shutdown -r and see if that does any difference.

I have listed an excerpt of /etc/log/syslog below. The last thing it records is the stopping of the logging.

Oct 24 10:14:49 servername kernel: [1354427.594709] init: cron main process (1060) killed by TERM signal
Oct 24 10:14:49 servername kernel: [1354427.594908] init: irqbalance main process (1080) killed by TERM signal
Oct 24 10:14:49 servername kernel: [1354427.595299] init: tty1 main process (1424) killed by TERM signal
Oct 24 10:14:49 servername kernel: [1354427.637747] init: plymouth-upstart-bridge main process (20873) terminated with status 1
Oct 24 10:14:49 servername kernel: Kernel logging (proc) stopped.
Oct 24 10:14:49 servername rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="876" x-info="http://www.rsyslog.com"] exiting on signal 15.
Oct 24 10:25:34 servername kernel: imklog 5.8.6, log source = /proc/kmsg started.
Oct 24 10:25:34 servername rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="862" x-info="http://www.rsyslog.com"] start
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  • Have you tried both methods you're suggesting ?
    – NorTicUs
    Oct 24, 2012 at 9:08
  • Not yet. For every reboot I have to walk to another building to get it restarted.
    – Finn Årup Nielsen
    Oct 24, 2012 at 11:25
  • I now I tried sudo reboot & and it did not work.
    – Finn Årup Nielsen
    Oct 29, 2012 at 9:44
  • I now also tried sudo shutdown -r now non-remotely, - and it did not work. My last messages are Unmounting local filesystems, Will now restart... and [a number] Restarting system which it obviously doesn't do.
    – Finn Årup Nielsen
    Nov 30, 2012 at 15:36

2 Answers 2

Reset to default
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Others have had the same problem: Why can't I restart/shutdown?

Colin Watson suggests trying different parameters for reboot= in grub.

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  • And now with GRUB_CMDLINE_LINUX="reboot=b" in /etc/default/grub it seems to work! At least two tests with sudo shutdown -r now got it right back.
    – Finn Årup Nielsen
    Dec 18, 2012 at 10:22
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You can also try sudo init6

For more evaluation, you should update the dmesg and syslog outputs , when the server restart.

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  • I have now tried "sudo init 6" in vain.
    – Finn Årup Nielsen
    Nov 15, 2012 at 13:48
  • I do not understand "you should update the dmesg and syslog outputs". I think it is after the logs are shut down that the problem begins.
    – Finn Årup Nielsen
    Nov 15, 2012 at 13:51

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