A bit of background first. I use my ubuntu computer as a media center and backup server, running Ubuntu 12.04. It's scheduled to shutdown at 1am everyday.

My problem is that the computer does not shutdown. It attempts to as scheduled sudo shutdown -h now, but then the computer stays on after halting. It also does this when I type it into command line or use the gui. The last thing it says is

Will now halt

[ 945.791650] Power Down

The screen stays on and the computer doesn't stop, I have to use reset button or hold power button. I have already appended acpi=force to the grub config with no avail.

Thanks for any help..


This worked for me:

For me, the solution was to upgrade the kernel. I used 4.5.3 on Ubuntu 15.10 (anything greater than this will crash the OS after login) And 4.7 RC3 works on Ubuntu 16.04.

Taken from SirAhaz's answer on Ubuntu 14.04 stuck on shutdown

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