I am new to Ubuntu. I was looking to see if double monitors were supported, and I accidentally disabled both of mine. What can I do? I tried plugging in a third monitor, but nothing happened.
You might be able to use xrandr to turn your monitor back on. Switch to another terminal with ctl-alt-f1, login and typing xrandr will list your monitors. (assuming xrandr is installed- you might have to sudo apt-get install xrandr) From there it'll be something like xrandr --output FILL-IN-NAME-HERE --auto
Hope it works for you