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