I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520.
I encounter a problem whenever I shutdown or restart; it kills all running processes (as far as I can tell), but once I get past the shutdown text screen and the screen goes black, my computer doesn't power off. The fans still run and the screen is still on, etc. I have to hold down the power button in order to complety shut down.
Does anyone know how to resolve this problem?
Best Answer
I have the same problem and found a solution which worked out for me.
Type in terminal:
sudo -i
(to get a root shell, sudo gedit is not recommended)gedit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"
update-grub
exit
(to end the root shell)I found it here: Dell Studio 1569 Cannot Shutdown in Ubuntu 11.10 or 12.04