If you are seeing this information message when running the ASL kernel:
** (pkttyagent:4775): WARNING **: 17:36:11.999: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)
This is happening because the polkitd user needs to be added to the procread group. Run these commands as root, and ensure that the procread group GID is 1001 in the file /etc/group. If the GID is set to any other number, this will not work:
usermod -a -G procread polkitd
service polkit restart
If you already have some group that is making use of GID 1001 then the polkitd user will need to be added to that group (denoted by <group name below>).
usermod -a -G <group name> polkitd
service polkit restart