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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.

Juan Antonio
  • 1,602

2 Answers2

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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!!

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