Installing Guest Additions Ubuntu 17.04 Zesty

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo add-apt-repository 'deb http://download.virtualbox.org/virtualbox/debian zesty contrib'
sudo apt update