I can't restart my laptop under Ubuntu 12.04 and the screen turns black with no response after clicking the Restart button.
How do I fix it?
Open the terminal and edit this
/etc/default/grub file under Ubuntu 12.04
sudo gedit /etc/default/grub
Find now this line:
Replace it with this one:
Save your file and close, then update Grub with this command:
Reboot your system, then try to restart your system to see if it works or not. If this is not working for you, repeat the same steps and try one of these lines instead: