Install Virtualbox 4.3 di Ubuntu Desktop 12.04

sudo sh -c 'echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) 
contrib" >> /etc/apt/sources.list'
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-4.3 

ref : 
http://ubuntuhandbook.org/index.php/2013/10/virtualbox-4-3-released-install-or-upgrade-in-ubuntu-linux-mint/