It appears that CPAN is configured to check module signing signatures, and that it expects to do so with key-id 93B84C15, but that key has not been imported into your GPG key-ring. When you say "exported a key to the default server," exactly what did you do?
Re: cpanp install, gpg: Can't check signature: No public key
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I installed Gpg4win, and went through the certificate creation steps in Kleopatra, including exporting to a server.
Do I have to import the key for each module or author? Is there some way to automate this?
I don't see the point of installing more than the odd module if I have to track down the public keys for each one. I suppose the whole distributed key thing is a real pain, as I'll have to find trusted authorities who host the public keys of the entities I want to communicate with.
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