Quoting Bardot J??r??me (bardot.jerome@???):

> I try to not use it on stretch, but life without network manager is not
> easy :)

There are several good alternatives. (I need to start keeping a list of
them.)

> I don't know if you know but hplip need policykit and therefore systemd.

You don't need _package_ HPLIP. You just need printer-driver-hpcups and
printer-driver-hpijs. Package hplip is an omnibus desktop-oriented
packaging of the HPIJS and HPLIP drivers, and therefore includes
GNOME-dependency hooks.