Howtogeek shows you how to install GNOME Shell on Ubuntu

Give GNOME Shell a spin if you’re looking for a slick, new Linux desktop environment. It’s similar to Unity in some ways, but more flexible in others – GNOME Shell supports extensions, which can add missing features.

GNOME Shell is the default interface in GNOME 3, and it’s a clear break from GNOME 2. To try GNOME Shell without installing anything on your current system, use the Ubuntu GNOME Shell Remix live CD.

  How to Install & Use GNOME Shell on Ubuntu