i3-wm is a window title manager for linux that can come really handy to use if you can get seperated from the mouse.
i3 needs openx to installed on your machine in order to work. Open a terminal and give the following command
sudo apt-get install xinit
then install the actual i3-wm by entering the command
sudo apt-get install i3-wm
Start the X server
startx
if you get an error at the ibar you must install the i3status bar
sudo apt-get install i3status