I have found the version from Oracle to be easier to use. They are also more up to date. Although some aspects are not open, I feel comfortable enough having the open version available.
Download both platform package and Extension Pack. (2 separate pages for this):
cd ~/Downloads sudo dpkg -i virtualbox-5. sudo dpkg -i virtualbox-5.1_5.1.12-112440~Ubuntu~xenial_amd64.deb
Lauch VirtualBox Next manually install Extension Pack from within the application
File->Preferences->Network Add NatNetwork
Use the main UI toolbar for the "Global Tools" button on the right. Add Host Only Networks
if common build utilities have not been added already, add them now
sudo apt-get install -y gcc make perl sudo /sbin/vboxconfig
Add any machines.