ubuntu 12.04 不能关机

Type in terminal:

1. sudo gedit /etc/default/grub

2. Find the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

3. Change this to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"

4. Save the file and close the file.

5. Finally, in terminal: sudo update-grub