Dual Monitor on Xubuntu

Install arandr from ubuntu software center and run it then set monitors layout properly and save settings into a shell script. 
Mine looks like

#!/bin/sh
xrandr --output VGA-1 --mode 1920x1080 --pos 0x0 --rotate normal --output DVI-I-1 --mode 1920x1080 --pos 1920x0 --rotate normal --output HDMI-1 --off

Add it into start up session in ubuntu session and startup settings.