The package ships a systemd service file outside
Systemd in Debian searches for unit files in
/etc/systemd/system. Notably, it does not look
/usr/lib/systemd/system/ for service files.
System administrators should have the possibility to overwrite a
service file (or parts of it, in newer systemd versions) by placing a
/etc/systemd/system, so the canonical location used
for service files is