process sentinel error --- am i running package.el correctly? error in process sentinel: Unsigned file ‘archive-contents’ at https://melpa.org/packages/ [2 times]

[Samuel Wales <samologist@gmail.com>]

  ;; [2023-05-15 Mon]
  ;; i am new to emacs packages, but not new to emacs
  ;; i recently upgraded to emacs 27
  ;; i followed these instructions from melpa:
  (require 'package)
  (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
  (setq package-check-signature 'all)
  (package-initialize)
  ;; i installed gnu-elpa-keyring-update from elpa
  ;; problems:
  ;; 1.  startup takes 9s instead of 4s
  ;; 2.  when i do m-x list-packages, i get error in echo area.
messages buffer says:
  ;; Importing package-keyring.gpg...done
  ;; Package refresh done
  ;; error in process sentinel: Unsigned file ‘archive-contents’ at
https://melpa.org/packages/ [2 times]
  ;; package list shows up, but it does not seem wise to install anything.


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