If you are not comfortable with the Ubuntu Unity desktop, you can try out Cinnamon desktop for a change. To do so, type the following commands in a terminal window:
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable <enter>
sudo apt-get update <enter>
sudo apt-get install cinnamon <enter>
Bonus you also get gnome 2 classic with it.
Logout, and after you select or enter your user ID on the login screen, choose the Cinnamon desktop from the list of desktops, and login.