404 Not Found when displaying Raring release notes upon upgrade

See attached screenshot. The update manager tries to display the release notes when upgrading via "update-manager -d", and what's displayed instead of the release notes is a 404 error page.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.174.4
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Fri Feb 15 20:04:30 2013
GsettingsChanges: b'com.ubuntu.update-manager' b'launch-time' b'1360987346'
InstallationDate: Installed on 2013-02-09 (6 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to quantal on 2013-02-16 (0 days ago)