be verified because the public key is not available: NO_PUBKEY B6D583CCBD33EEB8
E: The repository 'https://dl.packager.io/srv/deb/zammad/zammad/stable/debian 9 Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Кто нибудь значет что с этим делать?
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B6D583CCBD33EEB8
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