Which release of Ubuntu are you using? This was fixed in maverick in bug 574042.
10:20:31 - flash:[/tmp] dpkg-query -W --showformat='${Conffiles}' ifupdown /etc/network/if-down.d/upstart be2d7ca79c30064a88777f8c6c1d19fe /etc/network/if-up.d/upstart 1508668168bca783524789c4c87e28e2 /etc/init/network-interface.conf af7f31fee8f6192cae0518454ac2154b /etc/init/networking.conf 8af8451b188d626e6e7ea92c90d7d64f /etc/init/network-interface-security.conf 04449b8f4a377f06cab083dce987ae95 ** Changed in: ifupdown (Ubuntu) Status: Triaged => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/816117 Title: Files installed by ifupdown in /etc/init should be conffiles To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/816117/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs