I've been using Gnome (Hardy), and wanted to install xfce to save resources.
First I tried via synaptec, and installed the main package. This yielded an incomplete desktop and an error message.
I looked online and found instructions to use apt. It seemed to install fine, but I'm getting the same error message and still getting an incomplete desktop.
It's incomplete in that I have no taskbar, and possibly more missing that I haven't seen yet.
The error message is (paraphrased):
I've decided not to tinker with this until I get some help, as I don't want to lose anything.
....cannot find internet address for 'your-desktop'......As a result, XFCE will not operate correctly. You may be able to fix this problem by adding 'your-desktop' to /etc/hosts file.