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ERREUR GPG NO_PUBKEY: AVERTISSEMENT: les packages suivants ne peuvent pas être authentifiés!

Je viens de commencer à recevoir d’étranges erreurs concernant les clés GPG. À savoir que je viens d'ajouter ppa:ubuntu-toolchain-r/test et que je voulais mettre à jour et après cela, j'ai eu ceci:

W: GPG error: http://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: GPG error: http://archive.canonical.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: GPG error: http://qgis.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 030561BEDD45F6C3
W: GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991
W: GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991
W: GPG error: http://archive.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: GPG error: http://archive.ubuntu.com trusty-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: GPG error: http://archive.ubuntu.com trusty-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

J'ai essayé de le résoudre de 2 manières (à condition que ici )

for key in 40976EAF437D05B5 3B4FE6ACC0B21F32 A040830F7FAC5991 030561BEDD45F6C3 16126D3A3E5C1192  ; do Sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys $key ; done

mais cela n'a pas aidé (les mêmes erreurs ont continué à arriver avec les mêmes clés) alors j'ai essayé de faire ceci:

Sudo add-apt-repository ppa:webupd8team/y-ppa-manager
Sudo apt-get update
Sudo apt-get install y-ppa-manager

mais j'ai eu ce qui m'a ouvert les yeux:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  launchpad-getkeys libvte-common libvte9 python-keyring python-launchpadlib
  python-lazr.restfulclient python-lazr.uri python-oauth python-secretstorage
  python-simplejson python-vte python-wadllib xclip yad
Suggested packages:
  python-gdata python-keyczar python-kde4 python-testresources
  python-secretstorage-doc
The following NEW packages will be installed:
  launchpad-getkeys libvte-common libvte9 python-keyring python-launchpadlib
  python-lazr.restfulclient python-lazr.uri python-oauth python-secretstorage
  python-simplejson python-vte python-wadllib xclip y-ppa-manager yad
0 upgraded, 15 newly installed, 0 to remove and 29 not upgraded.
Need to get 915 kB of archives.
After this operation, 4,515 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
WARNING: The following packages cannot be authenticated!
  libvte-common libvte9 python-keyring python-lazr.uri python-simplejson
  python-wadllib python-oauth python-lazr.restfulclient python-launchpadlib
  python-secretstorage python-vte xclip
Install these packages without verification? [y/N]
14.04aptsoftware-sourcesgnupg
23
Patryk

Exécuter la commande:

Sudo apt-get update

Pour chaque clé à 16 caractères signalée comme manquante, exécutez la procédure suivante en remplaçant la clé:

Sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ABCDEFGH12345678
58
Patryk