I am trying to find out if there is a hot key to turn off the touchpad when using an external mouse. In windows I just double tap in the upper left hand corner and it disables the touchpad. Makes it nice when typing a long document or using an external mouse.
You can use Touchpad Indicator to assign a hotkey to enable and disable touchpad.
You can install Touchpad Indicator by downloading this installation package. If there is some dependency issue, you can install
sudo apt-get install python-pyudev
You can install it via ppa as follows.
sudo add-apt-repository ppa:atareao/atareao sudo apt-get update sudo apt-get install touchpad-indicator