I came across this blog post, which, among other things, has this excellent tip for us, laptop and netbook users – how to disable touchpad while typing.  The tip is specific for Gnome desktop and is rather easy to follow.  Navigate to System / Preferences / Mouse menu, switch to Touchpad tab, and check “Disable touchpad while typing” box.  Then close dialogue window and enjoy.  Here is a screenshot to make you life even easier.

Gnome : System / Preferences / Mouse / Touchpad

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