I get the same error. Only it gets stuck at the splash screen an no-login window appears:
(polkit-gnome-authentication-agent-1:3797): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'
(polkit-gnome-authentication-agent-1:3797): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
I get the same error. Only it gets stuck at the splash screen an no-login window appears:
(polkit- gnome-authentic ation-agent- 1:3797) : GLib-GObject- WARNING **: cannot register existing type `_PolkitError'
(polkit- gnome-authentic ation-agent- 1:3797) : GLib-CRITICAL **: g_once_init_leave: assertion `initialization _value != 0' failed