I'm trying to install plantuml-mode based on the instructions here:


I'm told to try the following:

M-x package-install<RET>

But the package isn't found:

Contacting host: elpa.gnu.org:80
Failed to download ‘gnu’ archive.

However, it is listed here on MELPA:


I don't have much experience installing things in Emacs. Is there some fool-proof way to get this installed on my mac, possibly with a 'recipe'?

I do have plantuml installed.

  • The error you are getting has nothing to do with MELPA or plantuml-mode: it has to do with ELPA and the gnu archive. Have you tried eliminating that from package-archives? – NickD Jan 26 '18 at 21:08

Sometimes the secure https connection doesn't work. Restart emacs and launch with

emacs --insecure

  • I doubt that's a good idea. Would you do that in your browser? – NickD Jan 26 '18 at 21:08
  • To make https connection always work, add this to your config.el file: ``` '(gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")``` – Ian Dec 19 '19 at 15:31

Just in case anyone faces the same problem, my problem was resolved after

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