Last version of base-files introducted a change in /etc/debian_version format. Code name used to be available in that file. It no longer is. This breaks many unattended-upgrades configurations, where $(distro_codename) is no longer available. Please, consider putting back the codename in debian_version until proper solution is found to store that information: With the deep freeze, now is not a proper time for big patches in other packages.
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