No problem!
It turns out /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 is not running. Starting it manually gives the following output, but now authentication works.
(polkit-gnome-authentication-agent-1:2461): GLib-GObject-WARNING **: cannot register existing type `_PolkitError' (polkit-gnome-authentication-agent-1:2461): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
So now the question is: why is the agent not running when I need it?
No problem!
It turns out /usr/lib/ policykit- 1-gnome/ polkit- gnome-authentic ation-agent- 1 is not running. Starting it manually gives the following output, but now authentication works.
(polkit- gnome-authentic ation-agent- 1:2461) : GLib-GObject- WARNING **: cannot register existing type `_PolkitError' gnome-authentic ation-agent- 1:2461) : GLib-CRITICAL **: g_once_init_leave: assertion `initialization _value != 0' failed
(polkit-
So now the question is: why is the agent not running when I need it?