Debian GNU／Linux(简称Debian)是目前世界最大的非商业性Linux发行版之一，是由世界范围1000多名计算机业余爱好者和专业人员在业余时间制做
在更新debian11的时候发现个了更新出错的问题，提示：
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
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