I had been messing with this for about 2 weeks before I figured out how to switch to classic mode. Ubuntu seems to appear differently on some peoples computers. For one thing, I had no log out option. To log out press Alt + F2. Then paste the following into the text box and press enter:
Once to the log in screen. If your computer is like mine, there still are no desktop options to be seen anywhere. At this point press Enter two times, and the desktop options will show up at the bottom of the screen. Choose the one you want(for instance classic is just like Ubuntu 10.10 default) and then log back in.