If you don’t like the default Unity interface in Ubuntu 11.10 — change it to Gnome 3.2. Here’s how.
First, open the terminal and type:
sudo apt-get install gnome-session-fallback
Enter your password when prompted.
After the message explaining 40MB of space will be required in order to complete the installation.
Type: Y and hit Enter to start the download and installation.
When the installation is complete, log out of your system. Click on the gear icon next to your username. You’ll notice two entries for Gnome – GNOME Classic and GNOME Classic (No effects). Select GNOME Classic and log back in.
That’s it. Now you’ll be able to use Gnome whenever you log in. If you want to change back, just click the gear icon again and change back to Ubuntu.