Full changelog of updated packages for Ubuntu releases?

Solution 1:

You can find all changelog on http://changelogs.ubuntu.com/, but it's difficult to see.
So the best strategy is to go to http://packages.ubuntu.com, search for interesting packages, and on right column click on "Ubuntu Changelog".

Solution 2:

Ubuntu Updates, has all the latest updates with change-log for all releases. It gives you Package name, Release, Repository, and when it was Updated, among other information.

^{Source:Ubuntu Updates}

Solution 3:

You could use apt-listchanges, which can display the changelog and NEWS.Debian of packages before upgrading packages.

Something like that should do the trick:

apt-get install apt-listchanges

Change /etc/apt/listchanges.conf to:

[apt]
frontend=text
confirm=1
save_seen=/var/lib/apt/listchanges.db
which=both

If you want to upgrade from 13.04 to 13.10, you need to change /etc/apt/sources.list.

Run apt-get upgrade or apt-get dist-upgrade on the system you want to upgrade.