I see the bug now too, the trouble here is that if two version of linux are available, it may get confused. I was able to reproduce it with the stock hardy linux-generic installed and the following packages in the archive:
$ rmadion linux-generic
[..]
linux-generic | 2.6.24.18.20 | hardy-security/restricted | amd64, i386
linux-generic | 2.6.24.19.21 | hardy-updates/restricted | amd64, i386
update-manager groks that the version in updates includes the changes of a version in security, but update-notifier does not.
Thanks for this additional information.
I see the bug now too, the trouble here is that if two version of linux are available, it may get confused. I was able to reproduce it with the stock hardy linux-generic installed and the following packages in the archive: restricted | amd64, i386 restricted | amd64, i386
$ rmadion linux-generic
[..]
linux-generic | 2.6.24.18.20 | hardy-security/
linux-generic | 2.6.24.19.21 | hardy-updates/
update-manager groks that the version in updates includes the changes of a version in security, but update-notifier does not.