Originally Posted by meizirkki

Pretty simple:

Add Ubuntu repository and install xbindkeys and wmctrl.

Then do like qole said here:

add

Code:

"wmctrl -r :ACTIVE: -b toggle,fullscreen"
   F6

to your /home/user/.xbindkeysrc

Then you can add Personal Menu item for xbindkeys or just run it from terminal. After running xbindkeys, either as user or as root, you will be able to fullscreen any app