1.切换到root用户，安装vim，修改镜像源文件

apt-get install vim 
vim /etc/apt/sources.list

注释掉原有的内容，添加如下阿里云的镜像源

deb http://mirrors.aliyun.com/debian/ bullseye main contrib 
deb-src http://mirrors.aliyun.com/debian/ bullseye main contrib 
deb http://mirrors.aliyun.com/debian/ bullseye-updates main contrib 
deb-src http://mirrors.aliyun.com/debian/ bullseye-updates main contrib 
deb http://mirrors.aliyun.com/debian/ bullseye-backports main contrib 
deb-src http://mirrors.aliyun.com/debian/ bullseye-backports main contrib 
deb http://mirrors.aliyun.com/debian/ bullseye-proposed-updates main contrib 
deb-src http://mirrors.aliyun.com/debian/ bullseye-proposed-updates main contrib

最后:wq保存退出。

2.执行下列命令更新系统

apt-get update

3.安装sudo命令即可

apt-get install sudo

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