"invalid GPG signature" trying to download latest kernel

[Russell East]

I'm trying to use up2date to download kernel-2.4.22-1.2179.nptl.
It downloads the data, then pops up a message:

    Question
    The package kernel-2.4.22-1.2179.nptl does not have a valid GPG 
signature.
    It has been tampered with or corrupted.  Continue?

I say no, and the process is done.   What's going on?

-- Russell

`uname -a`:
Linux gumnut 2.4.22-1.2174.nptl #1 Wed Feb 18 16:38:32 EST 2004 i686 
i686 i386 GNU/Linux