I'm using a laptop with built-in touch-pad that works in Windows 7. But after I switched to Ubuntu 12.04 LTS, it's not working now.
This seems to be a bug in 12.04.2. As stated in comments, a simple fix would be unloading the mouse driver and load it again like this:
This only keeps the touchpad working on this session. To make it permanent one can create a file like
protected by Community♦ Sep 2 '13 at 11:33
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