I hate “tap to click” on a laptop touchpad. In many installations it seems to be enabled by default. Some have a control panel for the mouse/touchpad set-up but in my current installation of Lubuntu 12.04 on my laptop there is no control panel setting. This article gives instructions for changing settings. However, it may not be clear from reading it that you will edit or create a new file called ~/.config/lxsession/Lubuntu/autostart and add the value @synclient MaxTapTime=0 to it and then reboot to have the new setting take effect. That one will disable “tap to click”. There are many other settings you can alter.
These instructions are specifically for Lubuntu but the directory structure can be changed to match your particular installation.