So, I guess what's really going on is that Apt::GPGV::TrustedKeyring was "deprecated", at least at the level of having a comment in the source to that effect, although there were no deprecation warnings I know of. And it was removed in 0.8.0. I guess we're supposed to use Dir::Etc::trusted now, although oddly I have to set that to a keyring file, not a directory. And it's similarly undocumented.
BTW I noticed that apt still contains this: ./cmdline/apt-key: eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring) -- see shy jo
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