To disable the touchpad while typing avoids unwanted movements of the pointer that could lead to giving focus to the wrong window. There’re graphical interfaces, for gnome use SystemSettings->Mouse&Touchpad, and for KDE install “kde-config-touchpad” package and launch
There’s also a command line program which gives more options for disable touchpad (tapping/scrolling) while typing. It’s syndaemon.
syndaemon comes default with Ubuntu installation. Run it in terminal:
syndaemon -t -k -i 3 -d
here are the parameters:
- -t: Only disable tapping and scrolling, not mouse movements, in response to keyboard activity.
- -k: Ignore modifier keys when monitoring keyboard activity.
- -i 3: How many seconds to wait after the last key press before enabling the touchpad.(default is 2.0s).
- -d: Start as a daemon, ie in the background.
For more options, read the man page: