拡張された適切な更新が失敗しました。イメージに InRelease ファイルがありません。

2時間前にパッケージを手動で更新しようとしました。 InReleaseは実際に私のミラーにありません。http://ftp.fr.debian.org/debian/dists/stretch/InReleaseまた、CDNの一つhttp://deb.debian.org/debian/dists/stretch/InRelease。

このInReleaseファイルはストレッチングによって失われると予想されますか？

me@stretch:~$ LANG=C sudo apt update
Err:1 http://ftp.fr.debian.org/debian stretch InRelease
  Temporary failure resolving 'ftp.fr.debian.org'
Err:2 http://security.debian.org/debian-security stretch/updates InRelease
  Temporary failure resolving 'security.debian.org'
Err:3 http://ftp.fr.debian.org/debian stretch-updates InRelease
  Temporary failure resolving 'ftp.fr.debian.org'
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://ftp.fr.debian.org/debian/dists/stretch/InRelease  Temporary failure resolving 'ftp.fr.debian.org'
W: Failed to fetch http://security.debian.org/debian-security/dists/stretch/updates/InRelease  Temporary failure resolving 'security.debian.org'
W: Failed to fetch http://ftp.fr.debian.org/debian/dists/stretch-updates/InRelease  Temporary failure resolving 'ftp.fr.debian.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.

wget InReleaseファイルを手動で試してみてください（ご覧のように、ネットワーク接続は良好です）。

me@stretch:~$ LANG=C wget http://deb.debian.org/debian/dists/stretch/InRelease
--2018-10-28 23:29:52--  http://deb.debian.org/debian/dists/stretch/InRelease
Resolving deb.debian.org (deb.debian.org)... 2001:67c:2564:a119::148:14, 2001:4f8:1:c::15, 2001:41c8:1000:21::21:4, ...
Connecting to deb.debian.org (deb.debian.org)|2001:67c:2564:a119::148:14|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: http://cdn-fastly.deb.debian.org/debian/dists/stretch/InRelease [following]
--2018-10-28 23:29:52--  http://cdn-fastly.deb.debian.org/debian/dists/stretch/InRelease
Resolving cdn-fastly.deb.debian.org (cdn-fastly.deb.debian.org)... 2a04:4e42:1d::204, 151.101.120.204
Connecting to cdn-fastly.deb.debian.org (cdn-fastly.deb.debian.org)|2a04:4e42:1d::204|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2018-10-28 23:29:52 ERROR 404: Not Found.