共计 1056 个字符，预计需要花费 3 分钟才能阅读完成。
报 404，应该如何解决啊
解决了
直接 vim /etc/apt/sources.list 复制代码
再把原来的删掉，我选 163 的源
deb http://mirrors.163.com/debian/ bullseye main non-free contrib
deb http://mirrors.163.com/debian/ bullseye-updates main non-free contrib
deb http://mirrors.163.com/debian/ bullseye-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ bullseye main non-free contrib
deb-src http://mirrors.163.com/debian/ bullseye-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ bullseye-backports main non-free contrib
#deb http://mirrors.163.com/debian-security/ bullseye/updates main non-free contrib
#deb http://mirrors.ustc.edu.cn/debian-security/ bullseye/updates main non-free contrib
#deb-src http://mirrors.163.com/debian-security/ bullseye/updates main non-free contrib
#deb-src http://mirrors.ustc.edu.cn/debian-security/ bullseye/updates main non-free contrib
deb http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib 复制代码注释掉解决 100%404 一般是源问题，失效了，注释，让它不起作用，再新增有效的源，
