GPG Error (Ubuntu 18.04 / 16.04 / ...)

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Debian 9 package broken

When I try to update my Debian 9 packages, I get: W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://download.owncloud.org/download/repositories/stable/Debian_9.0 Release: Die folgenden Signaturen waren ungültig: BADSIG 47AE7F72479BC94B ownCloud build service obsrun@localhost I have tried removing and readding the GPG key as described here: https://download.owncloud.org/download/repositories/pro…

Gpg apt error - BADSIG

Running Owncloud 10.4.1 on Debian 9, I noticed the repos changed to “…production” instead of “…stable…” So I tried with either one, and had a gpg BADSIG error so I cleaned apt, removed the key re added it, but I still get the same error. Does anyone have this error as well? and any advice if its a server or client error and how to fix it? " : GPG error: https://download.owncloud.org/download/repositories/production/Debian_9.0 Release: The following signatures were invalid: BADSIG 47AE7F7247…