ı am using emacs in manjaro linux and ı got error like this ```Error while verifying signature archive-contents.sig:``` when ı install jedi with M-x shortcut 
ı am looking at to this url <https://emacs.stackexchange.com/questions/233/how-to-proceed-on-package-el-signature-check-failure> but ı can not install **gnu-elpa-keyring-update** package because when ı write ```gnu-elpa-TAB``` M-x gives [No match]

package-archives values is:
```
package-archives is a variable defined in ‘package.el’.

Its value is
(("gnu" . "https://elpa.gnu.org/packages/")
 ("nongnu" . "https://elpa.nongnu.org/nongnu/")
 ("melpa" . "https://melpa.org/packages/"))
Original value was 
(("gnu" . "https://elpa.gnu.org/packages/")
 ("nongnu" . "https://elpa.nongnu.org/nongnu/"))

An alist of archives from which to fetch.
The default value points to the GNU Emacs package repository.

Each element has the form (ID . LOCATION).
 ID is an archive name, as a string.
 LOCATION specifies the base location for the archive.
  If it starts with "http(s):", it is treated as an HTTP(S) URL;
  otherwise it should be an absolute directory name.
  (Other types of URL are currently not supported.)

Only add locations that you trust, since fetching and installing
a package can run arbitrary code.

HTTPS URLs should be used where possible, as they offer superior
security.

  This variable may be risky if used as a file-local variable.
  This variable was introduced, or its default value was changed, in
  version 28.1 of Emacs.
  You can customize this variable.
```
init file is:
```
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)

(package-initialize)
(custom-set-variables
 '(package-selected-packages '(jedi)))
(custom-set-faces
```
there is comment lines but ı dont add them into here