Hello,
I think your download page should clarify that the user should select
YES to the Mirrors question or else no graphical desktop environment can
be installed, thus leaving the user with a console-only system. The
installer has a box to install a graphical environment and common system
tools, so the user is confused why no graphical environment is installed
despite the box being selected. However if one selects YES to the
Mirrors question then of course the available desktop environments
appear along with this setting.
An alternate solution might be to put the notice in the Installer itself.
Naturally this affects the CD builds.