把mirrors.tencentyun.com替换成你的源即可
国内源：
mirrors.tencent.com
mirrors.aliyun.com
mirrors.tuna.tsinghua.edu.cn
sed -i 's/deb.debian.org/mirrors.tencentyun.com/g' /etc/apt/sources.list
sed -i 's/security.debian.org/mirrors.tencentyun.com/g' /etc/apt/sources.list