I'd like to use
Xubuntu in 11.10 instead of Unity, how do I install it and switch to it?
Instructions for 11.10 and 12.04
At some point during the install, you will be asked to choose between
Logout, you will be confronted by the LightDM manager.
Then, click the little cog wheel, and select
Then, enter your password, hit Enter and you'll be logged into Xubuntu.
or use tasksel
Check xubuntu and uncheck ubuntu.
And to remove original gnome desktop (after jrg's how-to) remove the package
You also sould do