Over the past couple of weeks I've noticed that my Ubuntu 11.10 installation has had many security related updates, including changes to CA Certificates.
Is there Ubuntu web page that lists all updates valid updates and a summary of the changes?
In terms of security, the update process is pretty secure because of GPG signatures. Your machine has a GPG keyring with trusted keys for package archives (
http://packages.ubuntu.com/ is an online database of the official Ubuntu archives, which can be used to determine the latest version of packages (e.g. ca-certificates) and the package changelog. It isn't accessible over HTTPS unfortunately, so I wouldn't trust it for security purposes. The ubuntu-security-announce mailing list contains announcements of changes to the security archive (these messages can be verified with GPG if you subscribe to the list).