Installation Command does not work, see: https://dnf.readthedocs.io/en/latest/command_ref.html
Please also check line 68: the (Fedora) "polkit" equivalent Debian package is called "policykit-1".
For reference: https://packages.debian.org/stretch/policykit-1
But I´m not sure if policykit-1 is needed, since with qubes-template-debian-9-minimal-4.0.1-201901271906 it is enough to
1) install the template,
2) [user@dom0 ~]$ qvm-run -u root debian-9-minimal xterm
3) bash-4.4# apt install qubes-core-agent-passwordless-root
4) update the template
Best Regards,
Vinzenz
