It happens on karmic as well. Probably from something introduced in the policykit 0.9-4 release. Confirmed after all the duplicates found.
** Tags added: karmic ** Changed in: policykit (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/688996 Title: package policykit 0.9-4ubuntu2 failed to install/upgrade with "chown: invalid group: `root:polkituser'" -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs