May seem an odd situation but for some reason my pubring.gpg file was owned by the root, whilst keeping the sensible default permissions of 600.
Ubuntuzilla script just kept trying key exchange after key exchange because it couldn't write to it. It's probably a rather bizarre and unusual marginal case, but maybe it's worth checking the ability to write to the pubring file, and aborting (or something?) if it can't?
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