policykit-1 - 122-3 main

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 transitional package depends on polkitd, the system service used by
polkit, and pkexec, a setuid program analogous to sudo. They were
historically packaged together, but have been separated so that users of
polkitd are not required to install pkexec.