Hi all, discovered something. It looks like the keys are still not synced to the mirrors.
I changed from ftp.de.debian.org to deb.debian.org, and all is working like a charm. So, I suppose, this issue might be solved. But it would be nice to add a package with the actual keys into the repo. The keys in the package "debian-archive-keyring" are too old (2012.1.1). Thanks for all the help and have so much fun with debian! Its awesome! Best regards Hans
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