server – Turn off monitor using command line – Ask Ubuntu

I am runnning Ubuntu Server on my laptop. There is really no reason for the screen to be on. I have been trying to use this command to turn the screen off:

sleep 1 && xset dpms force off

The problem is I get the following error

unable to open display "".

Any idea what is going on / what is wrong? Any other suggestions for how to do this?

Source: server – Turn off monitor using command line – Ask Ubuntu

server – Turn off monitor using command line – Ask Ubuntu was last modified: July 13th, 2017 by Jovan Stosic