I was trying to install something or other tonight, using the (usually very simple) apt-get system on my web box, but it kept showing up with this error

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There are no public key available for the following key IDs:
XXXXXXXXXX

Where the X’s are a hash/key of some description. After some searching, The solution appears to be to import a key from a key-server (makes sense), here’s how:

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# gpg --keyserver hkp://wwwkeys.eu.pgp.net --recv-keys XXXXXXXXXX
# apt-key add /root/.gnupg/pubring.gpg
# apt-get update

Substituting in the same hash/key. Then, it just works…