How to fix “There are no public key available for the following key IDs” Error in Debian

I had recently run an apt-get update on one of my LVS/Keepalived machine's (good ole reliable debian etch). I haven't touched this machine since it was commissioned (more from the stance, "if it ain't broke don't fix it").

But I did have to add a few things so as I could have it handle the new MySQL replication I have just put in place. When I ran apt-get update I got an
# apt-get update
......
Fetched 5562B in 13s (421B/s)
Reading package lists... Done
W: There are no public key available for the following key IDs:
9AA38DCD55BE302B
W: You may want to run apt-get update to correct these problems
#


I tried running apt-get update with no luck so manually had to update the key via gpg.
# gpg --keyserver wwwkeys.eu.pgp.net --recv-keys XXXXXXXXXXXXXXXX
...
# apt-key add /root/.gnupg/pubring.gpg
...
# apt-get update
...

Where XXXXXXXXXXXXXXXX is your missing key.

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Cheers
Adam