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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