Could you please check if syndaemon works as you expect?
https://help.ubuntu.com/community/SynapticsTouchpad#Disabling%20the%20Touchpad%20Temporarily%20While%20Typing
thanks.
** Changed in: ubuntu
Status: Confirmed => Incomplete
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"Disable touchpad while typing" wrongly enables a disabled touchpad after typing
https://bugs.launchpad.net/bugs/501791
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