apt repository signatures

[Art Alexion]

Maybe something I did poking around in kgpg, but now apt keeps telling
me a couple of signatures are bad.  The message is:

W: GPG error: http://us.archive.ubuntu.com hoary-updates Release: The
following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu
Archive Automatic Signing Key <ftpmaster at ubuntu.com>
W: GPG error: http://archive.ubuntu.com hoary Release: The following
signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive
Automatic Signing Key <ftpmaster at ubuntu.com>

How do I go about fixing this?

-- 

_______________________________________
Art Alexion
Arthur S. Alexion LLC

PGP fingerprint: 52A4 B10C AA73 096F A661  92D2 3B65 8EAC ACC5 BA7A
The attachment -- signature.asc -- is my electronic signature; no need for alarm.
Info @ http://mysite.verizon.net/art.alexion/encryption/signature.asc.what.html

Key for signed PDFs available at
http://mysite.verizon.net/art.alexion/encryption/ArthurSAlexion.p7c
The validation string is TTJY-ZILJ-BJJG.
________________________________________

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