[GTALUG] Ubuntu with all-desktops-in-one ?

Hi all, With Debian, you can install all desktops (kde, gnome, xfce, etc) from ISO at first, and then choose which the desktop when you log in via gdm/kdm. Is there a version for Ubuntu which allows you to do that? Right now, you have to choose/install different ISO for each desktop. Or, do I have to start with "minimal install", and then install all the desktops afterwards? But, I don't know if gdm/kdm will pick up the desktops. -- William