Touchpad Two-Finger Scrolling

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http://askubuntu.com – I'm using a Inspiron 1318 64-bit Dell laptop. It has a touchpad on it, but only edge scrolling works, on Ubuntu. Back when I used to use Windows, I had two-finger scrolling, but since I've switched to Ubuntu( about a year ago on 11.04) I've lost the ability to use it. If I go to the Mouse settings in the Settings menu, the option for two-finger scrolling is grayed out. Any ideas? (HowTos)