hello. running ubuntu 13 64-bit server; setting up a network bridge so I can run virtual machines, etc. I discovered this "error" and what I did to fix it after editing the /etc/network/interfaces file as per your instructions:
user@servername:~$ sudo /etc/init.d/networking restart
ERROR: Calling a sysvinit script on a system using upstart isn't supported. Please use the 'service' command instead.
user@servername:~$ sudo service networking restart
networking stop/waiting
networking start/running
