I had the same issue with emacs-nox, but I have installed it on Windows
10 inside of WSL2 with Ubuntu 18.04.
I was able to workaround the issue with:
gpg --homedir ~/.emacs.d/elpa/gnupg --keyserver hkps://keyserver.ubuntu.com:443
--receive-keys 066DAFCB81E42C40
After successfully importing the key, a package-refresh-contents worked
fine.
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https://bugs.launchpad.net/bugs/1862713
Title:
Failed to verify signature archive-contents.sig
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