URL: https://www.progressiverobot.com/video-how-to-set-up-sudo-and-ssh-keys-on-ubuntu-14-04/

[youtube EuIYabZS3ow 480 854]

This tutorial screencast will show you how to set up a non-root superuser account (sudo) and SSH key authentication on an Ubuntu 14.04 server. Following these steps can improve the security of your server, and is recommended for all Linux servers.

A written tutorial on the same topic can be found progressiverobot.com