It's like this because the only-ubiquity installation mode (which is
likely to become the default in Hardy) includes a minimal display-
manager-like implementation that needs to start a window manager, and
currently relies on metacity in the case where the GTK frontend is to be
used. In order to
I have verified and this is true according to:
http://packages.ubuntu.com/gutsy/admin/ubiquity-frontend-gtk
This is also true in Hardy right now:
http://packages.ubuntu.com/hardy/admin/ubiquity-frontend-gtk
Confirming the bug, as I believe there is enough info for a developer to
respond.
**