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La mise à jour de 14.04 à 16.04 a échoué avec une erreur GPG

apt-get update after upgrade - Je reçois le message suivant

W: GPG error: http://archive.canonical.com/ubuntu xenial InRelease: At least one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial InRelease: At least one invalid signature was encountered.
W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-security InRelease: At least one invalid signature was encountered.
W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-updates InRelease: At least one invalid signature was encountered.
W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-updates InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-proposed InRelease: At least one invalid signature was encountered.
W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-proposed InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-backports InRelease: At least one invalid signature was encountered.
W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-backports InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

A essayé

Sudo apt-get clean
Sudo mv /var/lib/apt/lists /tmp
Sudo mkdir -p /var/lib/apt/lists/partial
Sudo apt-get clean
Sudo apt-get update

Cela n'a pas aidé.

Mon source.list actuelle:

###### Ubuntu Main Repos
deb http://ua.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 

###### Ubuntu Update Repos
deb http://ua.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
deb http://ua.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
deb http://ua.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse 
deb http://ua.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 

###### Ubuntu Partner Repo
deb http://archive.canonical.com/ubuntu xenial partner
14.0416.04updatesgnupg
6
Davinel

Corrigé avec rm -rf /etc/apt/trusted.gpg.d/*

Apparemment, les gpg de certains anciens dépôts gâchaient tout, même si ces dépôts étaient désactivés.

6
Davinel