This was posted a while ago and I am sure you have gotten your answer already, but for those who haven't.
Run these commands
sudo apt-get install xdotool
sudo apt-get install wmctrl
Then download the bash script from the following link (credit to jc00ke)
Personally, I have a directory in my root where I store all my personal scripts. However, where you download it is really up to you. Change it to have permissions so you can execute. For example, save the scripts as move-to-next-monitor.sh and then execute the following
chmod 755 move-to-next-monitor.sh
- settings manager -> keyboard -> application shortcuts
- Click Add
- Click Open and direct it to your script
- Assign a keyboard shortcut to it and voilà!
You now have a keyboard shortcut to switch a window from 1 screen to another. I am not sure how it works with more than 2 screens.