How to correctly install MATE desktop environment on Ubuntu 16.04 LTS and newer versions?

You have to install special task package with one of two methods:

  • with tasksel:

    sudo apt-get install tasksel
    sudo tasksel install ubuntu-mate-desktop
    
  • with APT:

    sudo apt-get install ubuntu-mate-desktop^
    

And then use the full power power and enjoy the beauty of MATE DE.


Notes:

  1. if you are interested in installing the minimal MATE DE - it is installable from other task package named ubuntu-mate-core^ - see my other answer.
  2. do not use tasksel to remove packages from the system (see this post for details)!