If I remember correctly, the upgrade just updates all packages from the vivid versions to the wily versions with some extra little cleanup(please correct me if I am wrong).
If you would like to compare each package in the repository, you can use the following link, replacing vivid with wily when you want to get the package version for wily. http://packages.ubuntu.com/vivid/apport -- Have a nice day, Simon Quigley tsimonq2 Contact for the Ubuntu US Wisconsin LoCo Team Lubuntu Quality Assurance Tester -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss