I tried creating a monitors.xml in config folder using gedit and just saved it there. rebooted but doesn't work.
I am trying this link.
http://www.sudo-juice.com/dual-monitor-settings-in-ubuntu/
But this requires that you should have monitors.xml but I don't have that file on config.
Ubuntu – How to set up the dual monitors? My config folder does not have monitors.xml in ubuntu 12.04
12.04monitormultiple-monitors
Best Answer
There's no need to manually edit configuration files for dual monitor in Ubuntu. Just plug in all monitors you want to use and go to System Settings → Screen Display to set everything up to your preference.