Ubuntu18.04 disable laptop keyboard

1. Enter the first command-line tool

xinput list

Find AT Translated Set 2 keyboard, remember the back of ID, such as my ID was 21.

Input command to set the value of 0

xinput set-prop 21 "Device Enabled" 0 

Then laptop keyboard can not be a valid input.

If you want to use to restore the line, enter the command:

xinput set-prop 21 "Device Enabled" 1

We can continue to use the notebook keyboard!