Dr. Nikolaus Klepp wrote:

> I don't think that this aproach would be a wise: after each "apt-get
> update" you'd have repeat the manipulation.
> 
> Nik

Thanks, I need to read more about it how it works, but it is a good hint.
For instance I was expecting as an answer something like this here:

        Prevent apt from installing systemd packages in the future.

 echo -e 'Package: systemd\nPin: origin ""\nPin-Priority: -1'
> /etc/apt/preferences.d/systemd


http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_jessie/sid_installation