Pour savoir quels paquets ont été mis à jour, et avaoir du même coup le changelog, ustiliser le paquet apt-listchanges :

Display change history from .deb archives

apt-listchanges is a tool to show what has been changed in a new version of a Debian package, as compared to the version currently installed on the system. It does this by extracting the relevant entries from the Debian changelog file, and the NEWS.Debian file.

It can be run on several .deb archives at a time to get a list of all of the changes that would be effected by installing or upgrading a group of packages. It can be configured to do this automatically during upgrades using apt.