I was trying to install beacon and got this error,

package--check-signature-content: Failed to verify signature: "seq-2.20.tar.sig"

Before installing, I ran package-refresh-content which gave an error about the verification of a public key in *Error*:

Failed to verify signature seq-2.20.tar.sig:
No public key for <some id> created at 2019-09-21T12:54:43-0500 using RSA
Command output:
gpg: Signature made Sat 21 Sep 2019 12:54:43 PM CDT
gpg:                using RSA key <some key>
gpg: Can't check signature: No public key

There was also this error in the *Messages* buffer,

Contacting host: elpa.gnu.org:80 [2 times]
Failed to download ‘gnu’ archive.

Here is how my .emacs file's package archives variable looks like,

(setq package-archives '(("gnu" . "http://elpa.gnu.org/packages/")
             ;; ("marmalade" . "https://marmalade-repo.org/packages/")
             ("melpa" . "http://melpa.milkbox.net/packages/")))

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