$ pkexec mc
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ====
Authentication is needed to run `/usr/bin/mc' as the super user
Authenticating as: leo
Password: 
==== AUTHENTICATION COMPLETE ====
**
ERROR:../polkit-126/src/programs/pkexec.c:143:pam_conversation_function: code should not be reached
Bail out! ERROR:../polkit-126/src/programs/pkexec.c:143:pam_conversation_function: code should not be reached
Aborted