[已解决] Debian 10 报错：The repository ‘http://deb.debian.org/debian buster-backports Release’ does not have a Release file.

事件：站长今日新购一台低配置VPS，系统为Debian 10，按惯例将4.19.x.x的内核版本升级到官方最新5.10.x.x内核。在添加buster-backports源之后，apt update却报错了。

报错内容：The repository ‘http://deb.debian.org/debian buster-backports Release’ does not have a Release file.

解决办法：将将 buster-backports 源从http://deb.debian.org/debian 切换到 http://archive.debian.org/debian 即可。

以下为本次事件完整记录(含截图)。

报错完整记录：

root@hostcsr.com:~# apt update -y
Hit:1 http://security.debian.org/debian-security buster/updates InRelease
Hit:2 http://deb.debian.org/debian buster InRelease       
Hit:3 http://deb.debian.org/debian buster-updates InRelease
Ign:4 http://deb.debian.org/debian buster-backports InRelease
Err:5 http://deb.debian.org/debian buster-backports Release
  404  Not Found [IP: 146.75.94.132 80]
Reading package lists... Done
E: The repository 'http://deb.debian.org/debian buster-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

报错截图：

修复办法：将 buster-backports 源从http://deb.debian.org/debian 切换到 http://archive.debian.org/debian 即可。

编辑sources.list：

nano /etc/apt/sources.list

原始 buster-backports 源

deb http://deb.debian.org/debian buster-backports main

修改 buster-backports 源后

deb http://archive.debian.org/debian buster-backports main

完整 sources.list 示例：

deb http://deb.debian.org/debian/ buster main
deb-src http://deb.debian.org/debian/ buster main

deb http://security.debian.org/debian-security buster/updates main
deb-src http://security.debian.org/debian-security buster/updates main

deb http://deb.debian.org/debian/ buster-updates main
deb-src http://deb.debian.org/debian/ buster-updates main

deb http://archive.debian.org/debian buster-backports main

完整 sources.list 示例：(截图)

之后 apt update 正常，如下图。

升级内核可以参考本站文章：Debian 10 如何升级官方buster-backports源5.10.X内核版本