The GNOME 2 Fork 'Mate' is a desktop environment that is used in Fedora 16 replacing Gnome 3. If you wish to use this desktop environment on Ubuntu 11.10 Oneiric Ocelot to replace your current Unity or Gnome Shell interface, then follow the instructions given below.
>> We need first to add the main Linux Mint 12 repository to your repository list. So, open the Terminal (Press Alt+F2 and type: gnome-terminal -or- Press Ctrl+Alt+T) and run this command to edit /etc/apt/sources.list:
At the end of the file add this line:
Save your file and close.
deb http://packages.linuxmint.com/ lisa main upstream import
Now run the following commands in the Terminal:
Log out the current session, and at the login screen, select MATE, then login normally: