I am getting a similar error with apt-cacher-ng backported to Squeeze (via Ubuntu Lucid PPA) and think that it is related.
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.debian.org squeeze/updates Release: The following signatures were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <[email protected]> W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://backports.debian.org squeeze-backports Release: The following signatures were invalid: BADSIG AED4B06F473041FA Debian Archive Automatic Signing Key (6.0/squeeze) <[email protected]> [...] W: Failed to fetch http://security.debian.org/dists/squeeze/updates/Release W: Failed to fetch http://backports.debian.org/debian-backports/dists/squeeze-backports/Release This happens after ~1 day and a restart of apt-cacher-ng fixes it, too. I am attaching the contents of /var/cache/apt-cacher-ng/security.debian.org/dists/squeeze/updates/ (without subdirectories). It never happened on my Ubuntu (12.04) box, where I also have backported acng to. -- http://daniel.hahler.de/
breakage_signature_traces.tgz
Description: application/compressed-tar
signature.asc
Description: OpenPGP digital signature
