Bug#796633: nbd-client: Has init script in runlevel S but no matching service file

[Alkis Georgopoulos]

One side effect of this issue is that it prohibits network-manager from 
starting, because systemd sometimes deletes it to break the dependency 
cycle:
https://bugs.launchpad.net/ubuntu/+source/nbd/+bug/1487679
pitti there suggested a quick fix of setting "Default-Start:" to "2 3 4 
5" instead of "S".
Is that a reasonable thing to do until the implementation with the 
nbd-generators is released?

Thanks!