There are a lot of improvements since the last version this software is growing really fast, that’s the power of open source ;)
From prompt:
wget -q http://www.virtualbox.org/debian/innotek.asc -O- | sudo apt-key add -
You should see “OK“
sudo gedit /etc/apt/sources.list
and put at the end of the file
deb http://www.virtualbox.org/debian gutsy non-free
then:
sudo apt-get update
sudo apt-get install virtualbox
remember to add your user to vboxusers group, and now happy virtualization to everyone ;)