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.
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Juan Antonio
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DisplayName
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2 Answers
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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!!

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

DisplayName
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sudo init 0
work? – Nisheet Jan 20 '17 at 12:33http://pastebin.com/EGvXCRsD
– DisplayName Jan 23 '17 at 09:36GRUB_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 10:55doesn't work for me.
– DisplayName Jan 23 '17 at 11:53