Touchpad Doesn't Work in Ubuntu 9.10

I recently upgraded Ubuntu 9.04 to Ubuntu 9.10. After the upgraded my touchpad didn't work, but if a plug in a usb mouse it works raight. So in the web i find this solution.

Open a terminal (if you don’t have a mouse hooked up, use Alt+F2). then “su” and give the root password (I tried doing this with sudo and still didn’t have enough permission. I “think” you need to be root). At the prompt, type:

#echo options psmouse proto=exps > /etc/modprobe.d/psmouse.modprobe

At the next prompt, type”

#reboot

Your touchpad will come back up after rebooting.