I found that on two freshly installed Ubuntu 16.04-LTS desktops, for some reason I can't perform reboot or shutdown. I click on reboot/shutdown in the upper right corner's popup dialog but nothing happens when I chose reboot or shutdown option. It is OK when I do the same in terminal window by issuing shutdown or reboot command.

  • does sudo init 0 work? – Nisheet Jan 20 '17 at 12:33
  • yes, moreover: when I click on Shutdown or Reboot on my desktop then foloowing message appears in the syslog: pastebin.com/EGvXCRsD – Syn Romana Jan 23 '17 at 9:36
  • Might be a kernel issue, as stated in the bug here. Try with the latest kernel if it fixes the issue. – Nisheet Jan 23 '17 at 10:52
  • Some users have fixed it be editing /etc/default/grub line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force" then run sudo update-grub Source – Nisheet Jan 23 '17 at 10:55
  • GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force" doesn't work for me. – Syn Romana Jan 23 '17 at 11:53

I had the same problem, hard shut-off your computer (Holding the power button down for 10-20 seconds) and turn it on again. Not the most graceful way, but it works.
Hope this helps!!

  • How will this fix the problem that reboot/shutdown dialog doesn't worg ? On top you will risk having to do fsck on your filesystems at next boot and potentially loose data ! – Soren A Jan 20 '17 at 12:34
  • It worked for me, I don't know why but it was very glitchy when I first got ubuntu. – Ubuntu User Jan 20 '17 at 12:52

OK, finally I found the problem. The problem was with PAM configuration files modified during installation (from local preseed) process.

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