(setq package-archives '(("gnu" . "http://elpa.gnu.org/packages/")
                           ("org" . "http://orgmode.org/elpa/")
                           ("melpa" . "https://melpa.org/packages/")
                           ("melpa-stable" . "http://stable.melpa.org/packages/"))

  (setq package-archives
        '(("gnu" . "http://elpa.gnu.org/packages/")
          ("melpa" . "https://melpa.org/packages/")
          ("melpa-stable" . "http://stable.melpa.org/packages/")
          ("nongnu" . "https://elpa.nongnu.org/nongnu/"))

                                     ("org" . 3)))

                                     ("nongnu" . 3)))