I have Ubuntu 13.04 on my HP Pavilion G4-1025TX, which I don't think has multi-touch (it didn't have multi-touch when I was on the bundled Windows 7). Is it possible to enable multi-touch for this machine on Ubuntu?
If you download the Synaptics TouchPad driver from the Ubuntu Software Centre (search for synaptiks).
This worked well for me. You have to auto start it by putting it in the Start Up Programmes with