If you hate Unity as much as I, you can turn it off and use Classic Gnome 2 (known as Gnome Session Fallback) which is preferred my many Ubuntu users, who hate Unity and do not accept Gnome 3.
I have been trying a lot to get use to Unity but after several minutes I couldn’t stand it! Usability is none, switching between opened applications is silly and this ugly bar on the left. I will not say any bad words about Canonical developers and will go straight to the solution.
Open terminal and update repositories:
sudo apt-get update
Install Gnome Session Fallback:
sudo apt-get install gnome-session-fallback
After it is complete, log out and choose new desktop environment – Gnome Classic.
This solution works on Ubuntu 12.04, 12.10, 13.04 and 13.04 (probably on the future releases too).