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Debian Bug Tracking System
http://www.debian.org/Bugs/
Automatic system tracking bugs reported by users until they are resolved.
Debian Security Information
http://www.debian.org/security/
Alerts and updated packages in stable distribution.
Linux Security Patches
http://www.Linux-Sec.net/Patches
Security Patches and upgrades
Red Hat Errata
http://www.redhat.com/support/errata/
Errata for all releases of Red Hat Linux.