Install Zentyal 3.5 from apt repository

This is arguably the easiest install I've ever done.  Hats off to the Zentyal team for making a very clean and robust piece of software.

This works on Ubuntu 13.10 and 14.04, I have not tested on any other distro so use at your own risk!

add the source:
deb http://archive.zentyal.org/zentyal 3.5 main extra
to /etc/apt/sources.list

run:
sudo apt-get update
sudo apt-get install zentyal

open up your favorite web browser (Zentyal recommends firefox), and navigate to the ip address of your server.
for example, mine is https://192.168.3.186/
should be greeted with a login screen for Zentyal.
enter in your main user just as if you were logging in remotely.

Just a note, some modules are processor intensive.  Be aware of what you are enabling.

And that's it! Enjoy!

**I recently upgraded to 14.04 and zentyal does not work, conflicting perl versions are preventing zentyal-core from installing properly as seen here:
https://bugs.launchpad.net/ubuntu/+source/zentyal-core/+bug/1310694

UPDATE 05/29/2014:
Zentyal now works with ubuntu 14.04.
using the repository deb http://archive.zentyal.org/zentyal 3.5 main extra
(notice the 3.5, not 3.4)
 do a "sudo apt-get update && sudo apt-get install zentyal"