parrot-update-rc.d

There is a wrapper script parrot-update-rc.d containing blacklist and whitelist of services.

What is the official method of enabling a service?

  1. Edit the parrot-update-rc.d ?
  2. systemctl enable servicename?
  3. others?

Please advise.

systemctl enable servicename should be okay and the easiest way to enable a service.

You can use
either
systemctl enable servicename
for temporary purpose
you can use
service as well but this Does not enable / disable services or future boots