Every time I shutdown, I get the purple console where all messages are print out, and among those I read
I would delightfuly use upstart instead of the /etc/init.d interface, but I can't see how to fix this.Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service networking stop.
Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the service(8) utility, e.g. service networking stop.