[Solved] I've had this problem in Mint 13 (based on 12.04) as well but I finally tracked down the cause & resolved it tonight.
I only have a single user on my machine. I noticed if I started for example gparted manually with gksudo then I just get prompted for password. If I start gparted from the menu it is called by pkexec (policy kit) and I am prompted to select a user and my (only) user is displayed twice, a duplicate entry. This is different from when clean installed when it behaved the same as the gksudo i.e. password prompt only. I also couldn't remember exactly what had caused this to start happening. I found these two files that gave me a clue: /etc/polkit-1/localauthority.conf.d/50-localauthority.conf [Configuration] AdminIdentities=unix-user:0 ..and /etc/polkit-1/localauthority.conf.d/51-ubuntu-admin.conf [Configuration] AdminIdentities=unix-group:sudo;unix-group:admin User 0 is obviously root. I remembered when tinkering with the /etc/sudoers file I had experimented with group memberships. Sure enough I found my user was listed as a member of both the sudo and the admin groups. It seems polkit searches both these 'AdminIdentities' groups and since I belonged to both groups I'm assuming that's why I was listed in the pkexec authentication drop-down box twice. As admin group is now deprecated (see PrecisePangolin release notes snippet below) I simply chose to delete the admin group and logged in again. Problem solved. I'm sure the problem would also have been solved by simply removing my user from the admin group. WARNING: You must be certain you understand the contents of /etc/sudoers and your administrative user groups memberships before deleting groups or removing users from such groups. Otherwise you could end up with a system with no users allowed sudo privileges (and no root login I think in Ubuntu systems). In my case I think I created the admin group myself at some point as there is a %admin group entry in /etc/sudoers by default which is slightly different from the %sudo entry and I was curious about the differences. So for me it was safe enough to just delete the admin group. But if you have been upgrading from prior Ubuntu versions when admin group WAS in use then as I've already warned you'll need to check and be absolutely sure about the current state of how your sudo privileges work. https://wiki.ubuntu.com/PrecisePangolin/ReleaseNotes/UbuntuDesktop Common Infrastructure Up until Ubuntu 11.10, administrator access using the sudo tool was granted via the "admin" Unix group. In Ubuntu 12.04, administrator access will be granted via the "sudo" group. This makes Ubuntu more consistent with the upstream implementation and Debian. For compatibility purposes, the "admin" group will continue to provide sudo/administrator access in 12.04. I'm not sure it's exactly a bug. Well yes it is, but an extremely low priority one. It doesn't happen with default install and it's only going to occur if some one creates an admin group and then has users belonging to both sudo and admin groups. But if someone has an excess of time and is capable of fixing this (I'm not a coder or I would) then perhaps polkit pkexec could do a simple check for duplicate users before displaying the AdminIdentities drop- down choice. Anyway hopefully this helps anyone else searching for a fix after stumbling into this minor annoyance. G. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1042320 Title: The same user is listed multiple times in authentication dialog To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/policykit/+bug/1042320/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
