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 here: https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-14-04
Check out the DigitalOcean Community for more system administration tutorials: http://do.co/community
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You can watch this video also at the source.