404 error when independant repo sources are enabled after doing apt-get update

[Rocksinboxes]

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/source/Sources 404 Not Found

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: apt 0.8.16~exp5ubuntu14.1 [modified: usr/bin/apt-cache usr/bin/apt-config usr/bin/apt-get usr/bin/apt-mark usr/lib/apt/methods/ftp usr/lib/apt/methods/gzip usr/lib/apt/methods/rred usr/lib/apt/methods/rsh]
ProcVersionSignature: Ubuntu 3.1.0-2.3-generic 3.1.0
Uname: Linux 3.1.0-2-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 1.25-0ubuntu1
Architecture: amd64
Date: Tue Nov 8 00:25:56 2011
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111107)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

[DaleEMoore (daleemoore)]

root@RyCycle:~# cat /etc/issue
Ubuntu 11.10 \n \l

apt-get update && apt-get -y dist-upgrade && if [ -e /var/run/reboot-required ]; then echo "REBOOT required"; else echo "Not required to reboot at `date`."; fi

"do-release-upgrade -d" and "update-manager -d" both get to

                retry. W:Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/precise/main/source/Sources
                 404 Not Found , W:Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages
                404 Not Found

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.