Обновлял сейчас один старый ноутбук, на который был установлен Debian Buster ещё будучи в testing. Команда apt-get update не отрабатывала и завершала работу ошибкой:
E: Repository 'http://security.debian.org/debian-security buster/updates InRelease' changed its 'Suite' value from 'testing' to 'stable' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details. N: Repository 'http://http.us.debian.org/debian buster InRelease' changed its 'Version' value from '' to '10.0' E: Repository 'http://http.us.debian.org/debian buster InRelease' changed its 'Suite' value from 'testing' to 'stable' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details. E: Repository 'http://http.us.debian.org/debian buster-updates InRelease' changed its 'Suite' value from 'testing-updates' to 'stable-updates' N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
Данная проблема решается очень просто:
apt-get update --allow-releaseinfo-change