I have a new Dell Inspiron 17R that I have installed ubuntu 12.04 on. The touchpad is recognized as a PS/2 mouse, which means that I can't use scrolling and that there is no "Touchpad" tab in the mouse settings.

How can I fix this? I've searched for the answer, but there's very little information about 12.04, and people keep mentioning this .deb package that I am supposed to download from http://people.canonical.com/~sforshee/alps-touchpad/psmouse-alps-0.10/psmouse-alps-dkms_0.10_all.deb, which is a dead link.