[TrK]

Don't confuse people that the tutorial is only for "Ubuntu 14.04". It can work on any debian-based OS.
And P.S. I don't like the way you say that "You don't need knowledge...". You still need it when using those servers.

Agreed, without knowledge you can't manage a server, if you knows how to use/manage a server then you can easily install any package with help of documentation available on that Package's website.