Hello, I have additional informations regarding installing this package.
The package grub-efi-amd64-signed is installed with installing recommended packages. With my preseed-configuration, the recommended packages are not installed. Please see bug report #954856: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954856 Hopefully, this information helps and thank you for your support. Best regards Bernhard
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