"In addition to UCK, you need about 5GB of free disk space under
your home directory, as well as the ISO of the Ubuntu version you
want to customize. UCK supports four flavors of Ubuntu -- the
GNOME-based original Ubuntu, KDE-based Kubuntu, Xfce-based Xubuntu,
and education-targeted Edubuntu. You must also be running the same
Ubuntu version that you want to customize."