For anyone wondering how to get start-stop-daemon working with vibenews (especially serving static files from the right path)
do not, like I did, forget to add the chdir argument to start-stop-daemon.
Suppose vibenews is in /opt/vibenews:
start-stop-daemon --chuid ubuntu --background --chdir /opt/vibenews --oknodo --start --exec vibenews
Else vibenews will start serving static files from the absolute path of /public