1- Add Virtualbox Oracle repository

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

2- Add The Oracle public key :

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

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -

3- update the repos and install virtualbox

sudo apt-get update

sudo apt-get install virtualbox-5.1

4- Add VirtualBox User(s) to vboxusers Group

sudo usermod -a -G vboxusers username

5- Start virtualbox : VirtualBox

Don't forget to Subscribe / like & share.