virtualbox debian virtualbox-4.3

gksudo gedit /etc/apt/sources.list

Add the following line
Add one of the following lines according to your distribution to your /etc/apt/sources.list:

deb http://download.virtualbox.org/virtualbox/debian oneiric contrib
deb http://download.virtualbox.org/virtualbox/debian natty contrib
deb http://download.virtualbox.org/virtualbox/debian maverick contrib non-free
deb http://download.virtualbox.org/virtualbox/debian lucid contrib non-free
deb http://download.virtualbox.org/virtualbox/debian karmic contrib non-free
deb http://download.virtualbox.org/virtualbox/debian hardy contrib non-free
deb http://download.virtualbox.org/virtualbox/debian squeeze contrib non-free
deb http://download.virtualbox.org/virtualbox/debian lenny contrib non-free


wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -



sudo apt-get update

sudo apt-get install virtualbox-4.1
sudo apt-get install virtualbox-4.3

sudo apt-get install dkms