1.备份当前的源列表文件,以便出现问题时可以恢复

cp /etc/apt/sources.list /etc/apt/sources.list.backup

2.添加阿里云的镜像源

echo "deb http://mirrors.aliyun.com/debian/ bullseye main contrib non-free" > /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/debian/ bullseye main contrib non-free" >> /etc/apt/sources.list

3.更新 apt-get 的软件包列表

apt-get update
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