How to Disable DELL N4050 ALPS touchpad in Ubuntu

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http://ubuntuguide.net – In Ubuntu 11.10, Dell Inspiron N4050 can’t disable its touchpad as usual way in System Settings. If you’re looking for a solution, try this method: Open up a terminal window and execute command: xinput list It outputs a list of devices: ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ USB OPTICAL MOUSE id=11 [slave pointer (2)] ⎜ ↳ ImPS/2 ALPS GlidePoint id=13 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Power Button id= (HowTos)