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Das Update von 14.04 auf 16.04 ist mit einem GPG-Fehler fehlgeschlagen

apt-get update nach dem Upgrade - Ich erhalte folgende Meldung

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.

Versucht

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

Es hat nicht geholfen.

Meine aktuelle source.list:

###### 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
6
Davinel

Behebung mit rm -rf /etc/apt/trusted.gpg.d/*

Anscheinend hat gpg eines alten Repositorys die Dinge durcheinander gebracht, obwohl diese Repositorys deaktiviert waren.

6
Davinel