Comment 26 for bug 82853

So it appears that:

Ubuntu is up to date against the corresponding Debian package, and the 12.04 release is also reasonably close.

The smbk5pwd overlay is specifically disabled in the Ubuntu build. This is from the changelog:

+ Don't build smbk5pwd overlay since it uses heimdal instead of krb5:
        - debian/control:
          - remove build-dependency on heimdal-dev.
          - remove slapd-smbk5pwd binary package.
        - debian/rules: don't build smbk5pwd slapd module.

In the past (natty and earlier), heimdal was not in main and openldap was, so this would have required this. I'm not sure what the reason is now, since heimdal-dev is in main since oneiric.