Comment 3 for bug 477832

Correct, the problem occurred before ever opening users-admin. I agree with moving the bug after the remaining rights issue is resolved.

Terminal log below. The account having the problem is "tristan". The account that didn't experience problems is "kateryna". Note though that the kateryna account does not have the administer permission nor the "configure printers" permission, so the groups are expected to be different. But I do still appear to be missing a permission that she has: "floppy". There doesn't appear to be an entry for that in users-admin (unless it has an unrelated name ...).

tristan@tinygod4:~$ cat /etc/polkit-1/localauthority.conf.d/51-ubuntu-admin.conf
[Configuration]
AdminIdentities=unix-group:admin
tristan@tinygod4:~$ groups
tristan adm dialout fax cdrom tape audio dip video plugdev fuse lpadmin netdev admin sambashare
tristan@tinygod4:~$ sudo su kateryna
[sudo] password for tristan:
kateryna@tinygod4:/home/tristan$ groups
kateryna adm dialout fax cdrom floppy tape audio dip video plugdev fuse netdev sambashare
kateryna@tinygod4:/home/tristan$ exit
exit
tristan@tinygod4:~$

I can use Update Manager as myself just fine.