How to change admin user for GUI?

[Josef Wolf]

On Tue, Nov 06, 2012 at 10:09:26PM +0000, Colin Law wrote:
> Also, does he then see a dialog asking for the password, but with a
> username above it?  If so he should be able to change the username to
> himself and then enter his password.

Yes, a dialog comes up, asking for _my_ password to get root permissions
_although_ he is logged in with his own account (which also has root
permissions). And this dialog has no way to change the username.