• Howto: Use, setup, and Take advantage of the New Ubuntu Uncomplicated Firewall UFW
• Setting up Signed Apt Repository With Reprepro
• Ubuntu Sources List Generator
  

Backports

• Debian Backports
• My way or the Highway - Part 2 (includes Quick and Dirty Backport HOWTO
• Using pbuilder to backport Debian packages
• UbuntuBackports (Community Documentation)
  
• UbuntuBackports (Ubuntu wiki)
  

AppArmor

• AppArmor (Ubuntu Community Documentation)
• DebuggingApparmor (Ubuntu Debugging Series)
  

Packaging

• Debian Binary Package Building HOWTO
• Debian New Maintainers' Guide
  
• Using Quilt (Debian Wiki)
  
• Ubuntu Packaging Guide: Complete
• Packaging Guide/Patch Systems: The Easiest Way (edubuntu)
  
• Creating a Debdiff (edubuntu)
• PbuilderHowto (edubuntu)
  
• Create Debian Linux packages
• Debian Policy Manual
• Packaging/PPA (Launchpad Help -> Packaging -> Personal Package Archives)