一台很老的Debian使用apt-get update的时候，出现一下报错：
Reading package lists... Done
N: Repository 'http://mirrors.163.com/debian buster InRelease' changed its 'Version' value from '10.7' to '10.13'
E: Repository 'http://mirrors.163.com/debian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
E: Repository 'http://mirrors.163.com/debian buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
E: Repository 'http://security.debian.org/debian-security buster/updates InRelease' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository can be applied. See apt-secure(8) manpage for details.
 
解决方法
1、使用一下命令：
apt-get update --allow-releaseinfo-change
 
2、再使用以下命令：
apt-get upgrade