bug#25532: 25.1; Error while verifying signature archive-contents.sig

[Charles-H. Schulz]

When running the automatic update of my package repositories (elpa, melpa,
marmalade) I have noticed since a few days that the update returns not a
single package to be updated. This has been the case of the course of 3 days
and it is unusual. One error appeared though today which may explain the
issue:

"Error while verifying signature archive-contents.sig:

Command output:
gpg: Signature faite le mar. 24 janv. 2017 23:05:02 CET
gpg:                avec la clef DSA 474F05837FBDEF9B
gpg: Bonne signature de « GNU ELPA Signing Agent <elpasign@elpa.gnu.org> » 
[inconnu]
gpg: Attention : cette clef n'est pas certifiée avec une signature de confiance.
gpg:             Rien n'indique que la signature appartient à son propriétaire.
Empreinte de clef principale : CA44 2C00 F917 74F1 7F59  D9B0 474F 0583 7FBD
EF9B"

The output is partly in French so I will roughly translate it: it shows that
the GNU ELPA signing Agent does have a valid key, however nothing shows it
belongs to its key owner.

Thank you. 



In GNU Emacs 25.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.5)
 of 2016-12-23 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.11901000
System Description:     Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fstack-protector-strong'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3
X11

Important settings:
  value of $LC_COLLATE: C
  value of $LANG: fr_FR.utf8
  locale-coding-system: utf-8-unix

Major mode: mu4e-headers

Minor modes in effect:
  hl-line-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  show-paren-mode: t
  display-time-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
No packages to upgrade.
[mu4e] Indexing... processed 2000, updated 8
user-error: No operations specified
[mu4e] Indexing... processed 204000, updated 124
scroll-down-command: Beginning of buffer [10 times]
[mu4e] Indexing completed; processed 204348, updated 124, cleaned-up 38
[mu4e] Found 500 matching messages
Invalid face reference: nil
Are you sure you want to execute 11 marks? (y or n) y
[mu4e] Found 79 matching messages

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