On Wed, Oct 17, 2012 at 8:40 PM, Martín Cigorraga <msx@xxxxxxxxxxxx> wrote: > I can reboot/shutdown with my user account from both CLI and inside X. > However > when I switch to another user if I try to reboot/shutdown from CLI I'm > asked for the > first logged user password (instead the root password!) while when inside X > I just > have the "Access denied" message - with not chance to enter any password to > authorize the command. A Polkit authentication agent must be running. Polkit itself only ships an agent for TTYs. Both polkit-gnome and polkit-kde contain an agent for X.