I found the following error from gpgv
to be a little opaque:
gpgv: unknown type of key resource 'trustedkeys.kbx'
gpgv: keyblock resource '/home/lars/.gnupg/trustedkeys.kbx': General error
gpgv: Can't check signature: No public key
It turns out that’s gpg-speak for “your trustedkeys.kbx
keyring doesn’t
exist”. That took longer to figure out than I care to admit. To get a key
from your regular public keyring into your trusted keyring, you can run
something like the following: