# sudo nano /etc/apt/sources.list
# deb http://download.virtualbox.org/virtualbox/debian xenial contrib
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 apt-get update
# sudo apt-get install virtualbox-5.0
sudo apt-get install virtualbox-5.1
sudo apt-get install dkms
# sudo apt-get install virtualbox-ext-pack
wget http://download.virtualbox.org/virtualbox/5.1.18/Oracle_VM_VirtualBox_Extension_Pack-5.1.18-114002.vbox-extpack
sudo VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-5.1.18-114002.vbox-extpack --replace
