right click doesn´t work on my asus notebook

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http://askubuntu.com – I just installed Ubuntu 12.04 and I noticed that my right ¨touchpad click¨ isn´t working at all. My touchpad is working fine 2 finger scrolling also works but right click doesn´t work. The tochpad worked fine under windows 7. The touchpad has a physical click, but I dont now if it knows the difference between left and right click.Is there some kind of solution for this problem? (HowTos)