How to Install MATE 1.14.1 (Desktop Environment) on Ubuntu 16.10 'Yakkety Yak' [PPA] :

You can update your system with unsupported packages from this untrusted PPA by adding ppa:ubuntu-mate-dev/crazy-mate to your system's Software Sources, open a new Terminal window and bash (get it?) in the following commands:

$ sudo add-apt-repository ppa:ubuntu-mate-dev/crazy-mate
$ sudo apt-get update
$ sudo apt-get install mate-desktop-environment


To remove, do :

$ sudo apt-get remove mate-desktop-environment