With multiple admin users, GNOME 3 authentication fails to ask for the password of the currently logged in admin user

[Sbari Nemui]

1) Ubuntu 11.10
2) gnome-shell: Installed: 3.2.0-0ubuntu1

3)
various system actions (e.g. installing software) require authentication. I have a shared system with several admin users, but the policykit authentication agent that comes with gnome-shell picks the wrong one (whose password I don't know) and offers no choice to select another user either. Basically making the system unusable.

4)
the correct user should be preselected, and changing users should be possible

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[JaSauders (jasauders)]

Same deal here. I've tested several scenarios with the same result each time where it comes up with the improper user selected (which always seems to be the user which was created first on the system, it seems).

[jimmux (jimmux)]

I've encountered the same problem while attempting to run updates.

As mentioned, it appears to be the first admin user created that is preselected.

[Jean-Philippe Guérard (fevrier)]

This is a known gnome 3 issue: https://bugzilla.gnome.org/show_bug.cgi?id=651547

It's bad, because it breaks the Ubuntu admin authentication logic.

[Jeremy Bícha (jbicha)]

This was fixed in Ubuntu 12.04 Alpha.

[fs-physik-bielefeld (ubuntu-fachschaft)]

Don't know if I should rather open another bug for this, but I still have the problem with an up-to-date Ubuntu 12.04 - but only with users that are defined over LDAP.
We have the following setup: There are two users that are administrators, and for the case that LDAP breaks down there is also a local user for each of us. There are also a lot of other users which are not administrators. Our usual users as well as the fact that they belong to the groups sudo and admin are defined via LDAP, the local users are just for emergencies. Now if I try to do something that requries authentication, I get promted to enter the password of the local user of the other administrator, which I do not know.
So it seems for the usual case where the administrators are local users this got fixed, the dialog asks for the current user's password there. But two problems that are still present are 1. polkit thinks a user that is defined over ldap is not authorized and 2. if polkit thinks a user is not authorized it still does not give the possibility to choose a specific administrator. If only one of these problems were present (p.e. if the dialog would implement a dropdown list like in gnome 2), I would be able to work around this.