Package: mirrors Severity: normal
% apt-get update Hit:1 http://security.debian.org buster/updates InRelease Hit:2 http://ftp.jp.debian.org/debian buster InRelease Hit:3 http://ftp.jp.debian.org/debian buster-backports InRelease Reading package lists... Done E: Release file for http://ftp.jp.debian.org/debian/dists/buster-backports/InRelease is expired (invalid since 1d 0h 43min 42s). Updates for this repository will not be applied.
