Debconf prompt for /etc/init/network-interface-security.conf when upgrading to precise

During an upgrade from 11.10 to 12.04 I encountered a prompt about /etc/init/network-interface-security.conf (see attached screenshot). The prompt asks me whether to keep the current file or use the new one. When the prompt appeared, I checked the filesystem to look at the file. I do not see /etc/init/network-interface-security.conf on the filesystem at all, and I am fairly sure that if it did exist in the past, I neither changed it or deleted it:

steve@steve-desktop:~$ ls -l /etc/init/network-interface-security.conf
ls: cannot access /etc/init/network-interface-security.conf: No such file or directory

The 'Different between the files' widget in the debconf dialog is empty, presumably because the 'old' file does not exist on my disk.

There may be 2 bugs here:
1) The file went missing (it is present on another machine running 11.10)
2) The user was prompted to replace a non-existent file

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ifupdown 0.7~beta2ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: i386
CheckboxSubmission: a098bfd5e654d8a6843b3807f9794817
CheckboxSystem: 775fcefe2ffae0651480113c04106442
Date: Wed Jan 18 12:48:20 2012
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ifupdown
UpgradeStatus: Upgraded to precise on 2012-01-18 (0 days ago)
modified.conffile..etc.init.network.interface.security.conf: [deleted]