With an internet connection you can install:
kubuntu-desktop 67MB/108MB download, uses 312MB additional hd space
ubuntu-desktop 115MB download, uses 542MB additional hd space

So people who would want to do this might include:
-no internet connection available who had cd’s mailed to them or burned by a friend
-who plan on installing either one more than a couple times before next release
-rolling it out on multiple desktops in a corporate environment

To install kubuntu-desktop KDE 3.4 on existing Ubuntu 5.04
insert Kubuntu 5.04 CD
sudo apt-cdrom add
sudo apt-get install kubuntu-desktop
logout | end session
Session or Session Type choose KDE, then login.

To install ubuntu-desktop GNOME 2.10 on existing Kubuntu 5.04
insert Ubuntu 5.04 CD
Ubuntu CD detected choose Cancel
sudo apt-cdrom add
Ubuntu CD detected choose Cancel
sudo apt-get install ubuntu-desktop
logout | end session
Session or Session Type choose GNOME, then login.

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