Why am I getting the following error messages?
Hit http://penguinppc.org ./ Packages Ign http://penguinppc.org ./ Release Hit http://ftp.us.debian.org stable/main Packages Hit http://ftp.us.debian.org stable/main Release Hit http://ftp.us.debian.org stable/non-free Packages Hit http://ftp.us.debian.org stable/non-free Release Hit http://ftp.us.debian.org stable/contrib Packages Hit http://ftp.us.debian.org stable/contrib Release Hit http://ftp.us.debian.org stable/main Sources Hit http://ftp.us.debian.org stable/main Release Hit http://ftp.us.debian.org stable/non-free Sources Hit http://ftp.us.debian.org stable/non-free Release Hit http://non-us.debian.org stable/non-US/main Packages Hit http://non-us.debian.org stable/non-US/main Release Hit http://non-us.debian.org stable/non-US/contrib Packages Hit http://non-us.debian.org stable/non-US/contrib Release Hit http://non-us.debian.org stable/non-US/non-free Packages Hit http://non-us.debian.org stable/non-US/non-free Release Hit http://non-us.debian.org stable/non-US/main Sources Hit http://non-us.debian.org stable/non-US/main Release Hit http://non-us.debian.org stable/non-US/contrib Sources Hit http://non-us.debian.org stable/non-US/contrib Release Err http://security.debian.org stable/updates/main Packages 404 Not Found Ign http://security.debian.org stable/updates/main Release Hit http://ftp.us.debian.org stable/contrib Sources Hit http://ftp.us.debian.org stable/contrib Release Hit http://non-us.debian.org stable/non-US/non-free Sources Hit http://non-us.debian.org stable/non-US/non-free Release Err http://security.debian.org stable/updates/contrib Packages 404 Not Found Ign http://security.debian.org stable/updates/contrib Release Err http://security.debian.org stable/updates/non-free Packages 404 Not Found Ign http://security.debian.org stable/updates/non-free Release Reading Package Lists... Building Dependency Tree...
