Install the latest VirtualBox version on Debian

Add the repository to sources list

sudo nano /etc/apt/sources.list
deb jessie contrib

Add the public key

sudo apt-key add oracle_vbox_2016.asc


wget -q -O- | sudo apt-key add -

Update and Install

sudo apt-get update
sudo apt-get install virtualbox-5.1

Install the dkms package

sudo apt-get install dkms