polkitd-pkla binary package in Ubuntu Mantic amd64

 polkit is an application-level toolkit for defining and handling the policy
 that allows unprivileged processes to speak to privileged processes.
 It was previously named PolicyKit.
 .
 This package configures the polkitd D-Bus service to read default
 authorization policies from .desktop-style files in subdirectories of
 /var/lib/polkit-1/localauthority. It is compatible with the version of
 polkitd used in Debian 11 and older releases.

Source package