[Ubuntu] Virtualbox Fullscreen on Ubuntu 10.10 Won't Work

I use Virtualbox to have the Ubuntu 10.10 (64-bit) version in my unit but the Fullscreen function doesn't work properly. If I go to View > Switch to Fullscreen, then the virtualbox window will have a fullscreen but not the ubuntu itself.

So I've research on how to do it and here's what works for me:

sudo apt-get update
sudo apt-get install build-essential linux-headers-$(uname -r)
sudo apt-get install virtualbox-ose-guest-x11 

Apparently, we need to solve first the Guess Additions Issue on Ubuntu 10.10 for the Fullscreen to take effect.

Enjoy! =D