Unlike Debian, Ubuntu seems to not show the changes and not trigger massive notifications when a NEWS article is created in a Debian package. This sometimes lets massive changes slip by, such as the change in the nginx PPAs and Debian prompting this other blog post.
This sometimes prevents users and admins from knowing that major changes that can break functionality are going through. To that end, there is the `apt-listchanges` package. During `upgrade` / `dist-upgrade` updates, it will provide you a full list of the changes in the packages being updated/upgraded. You may install this software with this command:
sudo apt-get update
sudo apt-get install apt-listchanges