My laptop has the same problem. Pointing, clicking, right-clicking, and tap-to-click worked fine. The side-scroll and middle button did not.
I performed a "sudo dpkg-reconfigure -phigh xserver-xorg" and it corrected the problem, along with another xserver problem I had. See https://wiki.ubuntu.com/LaptopTestingTeam/AcerAspire3003WLMi for more details. -- xorg.conf - synaptics touchpad misdetected? https://launchpad.net/bugs/46700 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
