sudo apt-add-repository -y 'deb http://download.virtualbox.org/virtualbox/debian xenial contrib'
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install -y dkms
sudo apt-get install -y virtualbox-5.2 --allow-unauthenticated

dpkg -l | grep virtualbox-dkms

sudo apt-get purge virtualbox-dkms &&
sudo apt-get install dkms

sudo /sbin/vboxconfig