One more occurrence gave the following warning
******************
W: A error occurred during the signature verification.
The repository is not updated and the previous index files will be used.
GPG error: http://archive.ubuntu.com hardy-updates Release:
The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
One more occurrence gave the following warning archive. ubuntu. com hardy-updates Release:
******************
W: A error occurred during the signature verification.
The repository is not updated and the previous index files will be used.
GPG error: http://
The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: Failed to fetch http:// archive. ubuntu. com/ubuntu/ dists/hardy- updates/ Release
W: Failed to fetch http:// security. ubuntu. com/ubuntu/ dists/hardy- security/ main/binary- i386/Packages. bz2 Hash Sum mismatch
W: Failed to fetch http:// security. ubuntu. com/ubuntu/ dists/hardy- security/ universe/ binary- i386/Packages. bz2 Hash Sum mismatch
W: Some index files failed to download, they have been ignored, or old ones used instead.