Aegir login link not working I am trying to install Aegir on Ubuntu.

I followed the installation instructions


sudo mysql_secure_installation
echo "deb http://debian.aegirproject.org stable main" | sudo tee -a /etc/apt/sources.list.d/aegir-stable.list
curl http://debian.aegirproject.org/key.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install aegir3



Everything got a success, but when I go to the login link that it provides me, the I get "server DNS address could not be found."

When I go to mydomain.com I get a 404 (which was working before). 

Why is this happening? What am I missing?
I hate providing a link answer, but in http://docs.aegirproject.org/en/3.x/install/#debianubuntu do steps 1-6 then you can install Aegir.

They main key being you need to do sudo hostname yoursite.com which was not mentioned in other docs.