How do I switch to Xubuntu?

Instructions for 11.10 and 12.04

Install the xubuntu-desktop package - to do that, run the following:

sudo apt-get update && sudo apt-get install xubuntu-desktop

At some point during the install, you will be asked to choose between gdm and lightdm - I prefer lightdm, so thats what the screenshot shows.

Logout, you will be confronted by the LightDM manager.

Then, click the little cog wheel, and select Xubuntu Session.

Then, enter your password, hit Enter and you'll be logged into Xubuntu.

enter image description here

or use tasksel

sudo apt-get install tasksel
sudo tasksel

Check xubuntu and uncheck ubuntu.