Emacs: package signature check failure

How to fix it

To paraphrase:

  1. set
    package-check-signature
    to
    nil
    , e.g.
    M-: (setq package-check-signature nil) RET
  2. download the package
    gnu-elpa-keyring-update
    and run the function with the same name, e.g.
    M-x package-install RET gnu-elpa-keyring-update RET
    .
  3. Restart emacs

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