更新Linux Mint8 Display Driver

XXX@com:~ sudo /etc/init.d/gdm stop
Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service gdm stop

Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the stop(8) utility, e.g. stop gdm
gdm stop/waiting
XXX@com:~exit

and,
sudo service gdm stop OR sudo /etc/init.d/gdm stop

Case ONE:

Result,
Sop appears to be an unknown instance

AND,
pgrep Xorg (that command will give you a number, then)
sudo kill ####

Case TWO:

(not an Xorg issue)
rmmod nvidia
modprobe nvidia