Weird. polkit-gnome-authentication-agent-1 should definitely be running, and though starting it doesn't solve your problem.
What does users-admin and /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 output if you start them in a terminal (the second first), and reproduce the bug?
Weird. polkit- gnome-authentic ation-agent- 1 should definitely be running, and though starting it doesn't solve your problem.
What does users-admin and /usr/lib/ policykit- 1-gnome/ polkit- gnome-authentic ation-agent- 1 output if you start them in a terminal (the second first), and reproduce the bug?