Antonio,
The problem is/was that some recent versions of Ubuntu start to support systemd. Since 07/02/2016, the install script checks, whether it is running on a systemd-capable version of Ubuntu and generates in this case an upstart and a systemd .service file (see also [1])
My impression was that Kenneth was using a fresh version of install-ns, probably on a "recent" version of Ubuntu.
-g
PS: For problem reports concerning system integration, please always write the exact version of the Operating System, since this helps reducing the guess work, since everything is in flux.
[1] https://openacs.org/forums/message-view?message_id=5329981
