New systemd service file path?

[Otto Kekäläinen <otto@kekalainen.net>]

Hello!

I noticed that Lintian has recently started erroring on
https://lintian.debian.org/tags/systemd-service-in-odd-location

I can't find this requirement anywhere in the Debian Policy, e.g.
https://www.debian.org/doc/debian-policy/ch-opersys.html#starting-system-services
does not mention anything about systemd paths.

Seems dh_systemd_enable still installs files into /lib/systemd/system/
and I find it confusing that apparently Lintian errors on what
debhelper does by default. Please enlighten me on what I have missed.

So, which one of these paths should be used and why?
- /lib/systemd/system/
- /usr/lib/systemd/system/

Thanks!