Hat-tip to pointer2null in the Dropbox wiki for the [systemctl info] (http://www.dropboxwiki.com/tips-and-tricks/install-dropbox-in-an-entirely-text-based-linux-environment#comment-2426857341)
As root
sudo add-apt-repository "deb http://linux.dropbox.com/ubuntu xenial main"
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 5044912E
sudo apt-get update
sudo apt-get install python-gpgme dropbox