wget https://releases.hashicorp.com/packer/1.2.0/packer_1.2.0_linux_amd64.zip
unzip packer_1.2.0_linux_amd64.zip
sudo mv packer /usr/local/bin/
http://howtoprogram.xyz/2016/11/29/install-packer-ubuntu-16-04-1-lts-xenial-xerus/
sudo touch /etc/apt/sources.list.d/virtualbox.sources.list
echo "deb http://download.virtualbox.org/virtualbox/debian xenial contrib" >> sudo /etc/apt/sources.list.d/virtualbox.sources.list
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-5.1