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
You can install it via ppa as follows.