Now to address this cancerous component issue that craps a systemd service out: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Run the commands line by line:
# add user to the group
$ groupadd -g 23 nohidproc
$ usermod -a -G nohidproc polkitd
$ mount -o remount,rw,hidepid=2,gid=nohidproc /proc
$ systemctl restart polkit
# nano /etc/fstab or run it directly
$ echo "proc /proc proc defaults,hidepid=2,gid=nohidproc 0 0" >> /etc/fstab
# add new mount
$ mount -a
$ systemctl restart polkit