As you might be knowing, Linux Mint features two desktop environments which are in development by the Mint team. One of them is Cinnamon which comes with rich graphical effects and a very nice look, and the other one is MATE, the fork of the good old Gnome 2, which is simple, fast and requires no introduction to those familiar with Linux environments. Once you install Linux Mint with Cinnamon, you might be interested in installing MATE alongside Cinnamon. Here is how to do that.
First of all, you need to install the MATE desktop environment. There are two ways to do it.
Install MATE using Software Manager
Enter your password when asked.
In the search box, type the following:
Install it to get MATE. It will install all dependent apps and libraries automatically.
Install MATE using the root terminal
From the root terminal, execute the following command:
# apt-get update && apt-get install mint-meta-mate
In the command above, the default console package manager, apt, is used. APT is default for all Debian, Ubuntu, Mint and other deb-based Linux distros.
Tip: You can access the root terminal right from the regular terminal window. You need to type the following command:
$ sudo su
Enter your password when asked and you are in the root shell.
Now, log out from your user session. You will see the login prompt. Switch the session there from the previous one to MATE. As for the default MINT-X login screen theme, you need to click the lambda icon in the top right corner of the login prompt to select the session: