WARNING: This is already installed in Dapper & all versions after, so you won’t need to install it. Click here for a tutorial on how to improve it though.
This page give’s info & links to the synaptics touchpad driver.
Even though your touchpad will work as a regular mouse in Ubuntu.. this driver will improve it by enabling the more advanced options.
You can install this in Ubuntu by either..
sudo apt-get install xserver-xorg-input-synaptics
Trouble Shooting Guide!