$ pkexec
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is required to modify fingerprint authentication data
Authenticating as: (MY USERNAME)
Password:
polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
==== AUTHENTICATION FAILED ===
Error executing command as another user: Not authorized

This incident has been reported.

$ service consolekit status
 * status: stopped
# service consolekit restart
 * starting consolekit . .
$ service consolekit status
 * status: crashed

$ groups
wheel network video audio storage polkitd $USERNAME