Bug#513964: more info

[Jon Dowland]

problem was not being in the powerdev group. I guess the desktop env.
task in d-i is what normally puts the primary user in this group? I
think that another route is needed (I always deselect everything in
tasksel and manually choose a subset of the gnome-desktop-environment
deps immediately afterwards)

secondly I think that there should be some kind of indication from g-p-m
as to why the call failed if it's a permissions issue on dbus. I'm
assuming (but haven't confirmed) that it is possible for g-p-m to
determine this.