I think this should say enough:
[INDENT]$ sudo apt-get dist-upgrade -su Reading Package Lists... Done Building Dependency Tree... Done Calculating Upgrade... Done The following packages will be REMOVED: krb5-user The following packages will be upgraded: libkadm55 libkrb53 2 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. Remv krb5-user (1.3.4-3 Ubuntu:warty) Inst libkadm55 [1.3.4-3] (1.3.4-3ubuntu0.1 Ubuntu:4.10/warty-security) [] Inst libkrb53 [1.3.4-3] (1.3.4-3ubuntu0.1 Ubuntu:4.10/warty-security) Conf libkrb53 (1.3.4-3ubuntu0.1 Ubuntu:4.10/warty-security) Conf libkadm55 (1.3.4-3ubuntu0.1 Ubuntu:4.10/warty-security)[/INDENT]
But just in case it doesn't, I'll go into more detail. I have 4 different servers configured with Kerberos packages and they all exhibit the same behavior. This security update specifically lists krb5-user as one of the updated packages. However when I do an upgrade it does not upgrade krb5-user. This tells me krb5-user is probably not in the Packages file in the security archive.
Further confirming this theory, "apt-get showpkg krb5-user" does not list a version from the security forum.
I have not done this security update yet because of this issue, and I'm sure I'm not alone, so that makes this problem itself a security issue.