How to disable and enable keyboard in ubuntu?

To Disable/Enable the keyboard, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

xinput -list

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Once you find your ID, then

sleep 0.1 ; xinput set-prop 9 'Device Enabled' 0 ; sleep 5 ; xinput set-prop 9 'Device Enabled' 1

sleep 5 is the number of seconds (I guess) you want the keyboard to be disabled.

For more information on the xinput command see the ManPage.

Or you can use Lock keyboard utility.

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