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I'm also having this problem. I'm able to reboot my laptop (even though there is a bit of a delay), but my computer never powers off (unless I hold down power button).

I've tried adding both 'reboot=bios' and 'reboot=bios' to 'GRUB_CMDLINE_LINUX_DEFAULT' and neither one has any effect. I also tried 'acpi=off' which was suggested here. Unfortunately, this didn't resolve the shutdown issue either.

I'm currently using xubuntu 13.10

$ uname -ior
3.13.0-031300rc8-generic x86_64 GNU/Linux
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Have you tried typing sudo shutdown -h 0 in terminal? –  Dusan Milosevic Feb 12 '14 at 23:18
I use *sudo shutdown -P 0' to specifically request power down –  user238802 Feb 13 '14 at 0:19

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