On old computers you may encounter a system halted error when running Ubuntu 9.10
To fix use terminal
1. in Terminal
sudo gedit /etc/modules
add to last line
apm power_off=1
save and exit gedit
2. in Terminal
sudo gedit /etc/default/grub
edit line that reads GRUB_CMDLINE_LINUX="" to
GRUB_CMDLINE_LINUX="noacpi acpi=off acpi=force apm power_off=1"
save and exit gedit
3. in Terminal
sudo update-grub
restart computer and you will be able to shutdown now!
