This post tells you how to install the mix of vagrant and virtualbox on ubuntu

sudo sh -c 'echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) contrib" >> /etc/apt/sources.list.d/virtualbox.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-4.2

sudo apt-get install vagrant

[Ruby] Install vagrant and virtualbox-4.2 on ububtu