2019-07-06 に Debian Buster 10 がリリースされました．
Debian 10 Buster testing 環境でリリース後に apt update をするとエラーになってしまいます．
$ sudo apt update Get:1 http://security.debian.org/debian-security buster/updates InRelease [39.1 kB] Get:2 http://deb.debian.org/debian buster InRelease [118 kB] N: Repository 'http://security.debian.org/debian-security buster/updates InRelease' changed its 'Version' value from '' to '10' 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. Do you want to accept these changes and continue updating from this repository? [y/N] N: Repository 'http://deb.debian.org/debian buster InRelease' changed its 'Version' value from '' to '10.0' E: Repository 'http://deb.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. Do you want to accept these changes and continue updating from this repository? [y/N] Reading package lists... Done E: Failed to fetch http://deb.debian.org/debian/dists/buster/InRelease E: Failed to fetch http://security.debian.org/debian-security/dists/buster/updates/InRelease E: Some index files failed to download. They have been ignored, or old ones used instead.
--allow-releaseinfo-change を指定してAPT にリリースを情報を確認したことを教えます．
$ sudo apt --allow-releaseinfo-change update
次からはオプション無しで実行してもエラーが出なくなります．
$ sudo apt update Hit:1 http://deb.debian.org/debian buster InRelease Hit:2 http://security.debian.org/debian-security buster/updates InRelease Reading package lists... Done Building dependency tree Reading state information... Done 3 packages can be upgraded. Run 'apt list --upgradable' to see them.
ちなみに stable でなく testing 環境を使い続けたい場合は /etc/apt/sources.list を現在の Debian testing の bullseye に修正すればいいはず．
参考URL
If you use apt-get to upgrade to buster, you won’t be asked about the security repository info changed from ‘testing’ to ‘stable’. Use the –allow-releaseinfo-change option, as Eriberto Mota explains here: http://eriberto.pro.br/blog/2019/07/07/debian-repository-changed-its-suite-value-from-testing-to-stable/ or use apt instead 🏛️
Debian: repository changed its ‘Suite’ value from ‘testing’ to ‘stable’ | Eriberto Blog 🏛️
環境
$ dpkg-query -W apt
apt 1.8.2
$ hostnamectl | egrep 'Operating System|Architecture'
Operating System: Debian GNU/Linux 10 (buster)
Architecture: x86-64