Hi,
> Unattended-Upgrade::Allowed-Origins { > "o=Debian, a=stable"; > "o=Debian Backports, a=buster-backports"; }; The problem with the example is that it uses a=CODENAME-backports and not a=stable-backports. The a= should be n= or codename= when using the CODENAME. I've created PR https://github.com/mvo5/unattended-upgrades/pull/359 for this. Cheers, Wesley