I installed Ubuntu 12.04LTS on my Lenovo Thinkpad Edge 320 and the Option to disable the trackpad while typing does not work. Thank you for your help!
You can use syndaemon to automatically disable touchpad while typing.
An example would be:
syndaemon -i -K -R -t -d
-i specifies how many seconds after last key press before enabling the touchpad (default is 2 seconds)
-K allows modifiers such as Shift and Alt
-R uses XRecord for detecting keyboard activity instead of polling
-t only disables tapping and scrolling but allows mouse movement
-d will start syndaemon as a daemon
you can see all of the options on