If you hate the Unity interface in the latest version of Ubuntu, try this. From a terminal prompt, enter:
sudo apt-get install gnome-session-fallback
I’d assume that you could also install gnome-session-fallback from Synaptic if you prefer. Then, choose “GNOME Classic” at signon.
Credit for this hint goes to this article:
EDIT: For another approach that might be more pleasing to some users, see How to install Linux Mint’s Cinnamon Desktop on Ubuntu (Linux Stall)