How to move from Ubuntu 17.04 Unity to Mate?

I found these instructions but I am a little bit reluctant to follow them blindly because the last modification date was in 2014.

To add context to the question:

A week ago I upgraded from 16.10 to 17.04. Today I read that future versions of Ubuntu will come with Gnome and abandon Unity. I want to take this as an opportunity to move not to Gnome but Mate. However, I do not want to do a fresh installation but keep my existing system.

Solution 1:

Moving to Mate can be done easily with

sudo apt-get install ubuntu-mate-desktop

It's a meta-package that allows you installing full Ubuntu Mate environment.