Proposed Repositories - GPG errors

[NoOp]

Anyone else getting failures on the proposed repositories today (Main
Server)?

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 jaunty-proposed Release: The following
signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive
Automatic Signing Key <ftpmaster at ubuntu.com>

W: Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/jaunty-proposed/Release

I get the same on karmic.