The internal mechanism used by apport to determine if the file is modified is using dpkg and verifying the md5sum of the file. Here's an example using whoopsie as I don't have powerd installed:
[ 9:25AM ] [ bdmurray@impulse:/var/crash ] $ dpkg-query -W --showformat='${Conffiles}\n' whoopsie /etc/default/whoopsie aa257e43c8f5113fc0e980b93185acac /etc/init.d/whoopsie a1f3d5bd15f8b85ab00fbcb827c0f0c4 /etc/init/whoopsie.conf 32d27c25706f1e6abf27c8bbb68b6b6e [ 9:27AM ] [ bdmurray@impulse:/var/crash ] $ md5sum /etc/default/whoopsie aa257e43c8f5113fc0e980b93185acac /etc/default/whoopsie The md5sum of whoopsie matches so I didn't modify the file. Its also possible that an application helped you modify the file although you may not have touched it directly. Plus run the same commands I've shown you for the powerd package and powerd.conf. ** Changed in: apport (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apport in Ubuntu. https://bugs.launchpad.net/bugs/1389286 Title: apport makes loose assumptions when reporting this bug Status in “apport” package in Ubuntu: Incomplete Bug description: Apport will make a loose assumption when reporting a problem with powerd. "it seems you have modified the contents of etc/init/powerd.conf" when I have done no such thing. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: apport 2.14.7-0ubuntu10 ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4 Uname: Linux 3.16.0-24-generic x86_64 ApportVersion: 2.14.7-0ubuntu10 Architecture: amd64 CurrentDesktop: Unity Date: Tue Nov 4 10:45:56 2014 InstallationDate: Installed on 2014-05-14 (173 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140514) PackageArchitecture: all SourcePackage: apport UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1389286/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp