Linux: Virtualbox no Ubuntu xenial (16.04.4)

echo "deb https://download.virtualbox.org/virtualbox/debian xenial contrib"| sudo tee /etc/apt/source.list
wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox