Installing Mate 1.8 for Ubuntu 14.10 Utopic
How to Install Mate 1.8 desktop on Ubuntu 14.10 Utopic Unicorn Linux.
The MATE desktop Environment is the continuation of GNOME 2. It provides an intuitive and attractive desktop environment.

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Open a Command Line Terminal Window
Ctrl+Alt+t on desktop
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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Installing Mate desktop for Ubuntu 14.10 Trusty.
You have Two Choices:
Mate Vanilla desktop (Classical Mate desktop)sudo apt-get install mate-desktop-environment-extras
Ubuntu Mate desktop (Mate Ubuntu Tweaked with Themes Integration)
sudo apt-add-repository ppa:ubuntu-mate-dev/ppa
sudo apt-get update
sudo apt-get install ubuntu-mate-core ubuntu-mate-desktop