No changelogs for all 50+ package updates

["Slim Joe" <slimjoe2k8@gmail.com>]

For the past four or five days I cannot see or download
the changelogs for any of the packages which the
Gnome Update Manager is supposed to install. A check
with synaptic confirms the problem. When I choose
\Package\Download_Changelog I get an error like:

Failed to fetch the changelog for [*]
URI was: http://packages.debian.org/[*]/changelog

Pasting the "changelog" URL into a browser leads to a
"404 Not Found" error. Is this a known problem? Or is
it just a problem with my apt setup.

apt 0.7.14+b1
apt-utils 0.7.14+b1
aptitude 0.4.11.8-1
python-apt 0.7.7.1
synaptic 0.62.1

TIA