Actually if you are running Ubuntu 8.10 the appropriate driver is 'intel
Your system should have installed that driver by default and autoconfigured your video card to use it
To verify your system is using that driver you can check the log files..
cat /var/log/Xorg.0.log | grep -i autoconfigured
you should get a result like..
Matched intel for the autoconfigured driver
if it says vesa, instead of intel, then the driver probably isn't installed..
sudo apt-get install xserver-xorg-video-intel
then restart X, and check the log file again