It isn't, of course, for the reason already given. In fact, the Debian people created two extra programs named deb-systemd-helper (with the same enable/disable

It isn't, of course, for the reason already given. In fact, the Debian people created two extra programs named deb-systemd-helper (with the same enable/disable/mask/unmask syntax as systemd's own systemctl) and deb-systemd-invoke (with the same start/stop/restart syntax as systemd's own systemctl) for performing all of these actions over package upgrades, employing a parallel set of service symbolic link farms. * https://manpages.debian.org/stretch/init-system-helpers/deb-systemd-helper.1p.en.html https://manpages.debian.org/stretch/init-system-helpers/deb-... * https://manpages.debian.org/stretch/init-system-helpers/deb-systemd-invoke.1p.en.html https://manpages.debian.org/stretch/init-system-helpers/deb-...