The following packages are affected: mozilla-thunderbird
For details on the issues addressed by the missing update, please visit the referenced security advisories.
Solution: The problem can be corrected by upgrading the affected package to version 1.0.8-0ubuntu05.04 (for Ubuntu 5.04) or 1.0.8-0ubuntu05.10.1 (for Ubuntu 5.10). After a standard system upgrade you need to restart Thunderbird to effect the necessary changes.