在更新debian11的时候发现个了更新出错的问题，主要是404 Not Found [IP: 151.101.26.132 80]、E: The repository 'http://security.debian.org bullseye/updates Release' does not have a Release file.一般来说是系统自带的source.list里面的链接是错误的，可能是从低版本升级上来的；解决办法就更换下源链接即可了。

root@zhujiceping:~# apt update

Hit:1 http://deb.debian.org/debian bullseye InRelease

Hit:2 http://deb.debian.org/debian bullseye-updates InRelease

Hit:3 http://deb.debian.org/debian bullseye-backports InRelease

Ign:4 http://security.debian.org bullseye/updates InRelease

Err:5 http://security.debian.org bullseye/updates Release

404 Not Found [IP: 151.101.26.132 80]

Reading package lists... Done

E: The repository 'http://security.debian.org bullseye/updates 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.

问题出在上面的源链接上，链接变了，换成这样：

debhttp://deb.debian.org/debian bullseye main

deb http://deb.debian.org/debian-security/ bullseye-security main

deb http://deb.debian.org/debian bullseye-updates main

请修改下源(/etc/apt/source.list)，替换成下面的吧：

deb http://mirrors.linode.com/debian bullseye main

deb-src http://mirrors.linode.com/debian bullseye main

deb http://mirrors.linode.com/debian-security/ bullseye-security main

deb-src http://mirrors.linode.com/debian-security/ bullseye-security main

deb http://mirrors.linode.com/debian bullseye-updates main

deb-src http://mirrors.linode.com/debian bullseye-updates main

如果是国内的机器建议切换阿里、腾讯、163等，只需要将mirrors.linode.com改为下面对应的你需要的源即可！

中科大：mirrors.ustc.edu.cn

清华：mirrors.tuna.tsinghua.edu.cn

阿里：mirrors.aliyun.com

腾讯：mirrors.tencent.com

网易：mirrors.163.com

华为：mirrors.huaweicloud.com