bad breezy-security gpg signature?

[Henry Lenzi]

On 2/13/06, Kevin MacNeil <k.macneil at verizon.net> wrote:
> Suddenly apt has been giving me the following error when I apt-get
> update:
>
> W: GPG error: http://security.ubuntu.com breezy-security Release: The
> following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu
> Archive Automatic Signing Key <ftpmaster at ubuntu.com> W: You may want
> to run apt-get update to correct these problems
>
> Everything has been running fine for months and I don't think I
> changed anything lately. Apparently I have to apt-key add a new gpg
> key, but I'm not sure where to get it from. Anyone know?
>

 I'm getting this error too. I did note a coincidence: I did an update
an libheimdal was updated. libheimdal, I'm guessing by the name, is a
crypto library (kerberos implementation?)

 Can you give more info on the apt-key infobite?

 TIA