minetest, gpg: Can't check signature: public key not found A547D8CD

[Hans Schou]

Hi

I got this problem:

dget
http://mentors.debian.net/debian/pool/main/m/minetest/minetest_0.4.3.20120909+dfsg-0.1.dsc
...
gpg: Signature made Sat Oct 20 02:42:02 2012 CEST using RSA key ID A547D8CD
gpg: Can't check signature: public key not found

Then I tried to get the key:

gpg --keyserver subkeys.pgp.net --recv A547D8CD
gpg: requesting key A547D8CD from hkp server subkeys.pgp.net
gpgkeys: key A547D8CD not found on keyserver

Am I doing something wrong or who is this person behind A547D8CD?

I did search for Michael Gilbert but the key is not there:
http://pgp.mit.edu:11371/pks/lookup?search=Michael+Gilbert&op=index

I'm sorry if I completetly got something wrong in my understanding of
signatures.

/hans
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