Temporary failure resolving 'mirrors.163.com'
结果发现系统默认的DNS有问题：nameserver 192.168.30.1
执行：
echo "nameserver 114.114.114.114" >/etc/resolv.conf && \
echo "nameserver 8.8.8.8" >>/etc/resolv.conf && \
echo "nameserver 192.168.30.1" >>/etc/resolv.conf
更新源：
echo "deb http://mirrors.163.com/debian/ stretch main non-free contrib" >/etc/apt/sources.list && \
echo "deb http://mirrors.163.com/debian/ stretch-updates main non-free contrib" >>/etc/apt/sources.list && \
echo "deb http://mirrors.163.com/debian/ stretch-backports main non-free contrib" >>/etc/apt/sources.list && \
echo "deb-src http://mirrors.163.com/debian/ stretch main non-free contrib" >>/etc/apt/sources.list && \
echo "deb-src http://mirrors.163.com/debian/ stretch-updates main non-free contrib" >>/etc/apt/sources.list && \
echo "deb-src http://mirrors.163.com/debian/ stretch-backports main non-free contrib" >>/etc/apt/sources.list && \
echo "deb http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib" >>/etc/apt/sources.list && \
echo "deb-src http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib" >>/etc/apt/sources.list
修改debian9 stretch源
修改配置文件/etc/apt/sources.list
修改成163源：
deb http://mirrors.163.com/debian/ stretch main non-free contrib
deb http://mirrors.163.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.163.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib
修改成清华源：
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main non-free contrib
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main non-free contrib
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main non-free contrib
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main non-free contrib
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main non-free contrib
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main non-free contrib
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main non-free contrib
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main non-free contrib
修改成科大源:
deb http://mirrors.ustc.edu.cn/debian/ stretch main non-free contrib
deb http://mirrors.ustc.edu.cn/debian/ stretch-updates main non-free contrib
deb http://mirrors.ustc.edu.cn/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian/ stretch main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian/ stretch-backports main non-free contrib
deb http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main non-free contrib
---------------------
作者：Krup
来源：CSDN
原文：https://blog.csdn.net/krupzone/article/details/78957013
版权声明：本文为博主原创文章，转载请附上博文链接！
中科大镜像站
deb https://mirrors.ustc.edu.cn/debian/ stretch main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ stretch main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ stretch-updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ stretch-updates main contrib non-free deb https://mirrors.ustc.edu.cn/debian/ stretch-backports main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian/ stretch-backports main contrib non-free deb https://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
阿里云镜像站
deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb http://mirrors.aliyun.com/debian-security stretch/updates main deb-src http://mirrors.aliyun.com/debian-security stretch/updates main deb http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
华为镜像站
deb https://mirrors.huaweicloud.com/debian/ stretch main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ stretch main contrib non-free deb https://mirrors.huaweicloud.com/debian/ stretch-updates main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ stretch-updates main contrib non-free deb https://mirrors.huaweicloud.com/debian/ stretch-backports main contrib non-free deb-src https://mirrors.huaweicloud.com/debian/ stretch-backports main contrib non-free
兰州大学镜像站
deb http://mirror.lzu.edu.cn/debian stable main contrib non-free deb-src http://mirror.lzu.edu.cn/debian stable main contrib non-free deb http://mirror.lzu.edu.cn/debian stable-updates main contrib non-free deb-src http://mirror.lzu.edu.cn/debian stable-updates main contrib non-free deb http://mirror.lzu.edu.cn/debian/ stretch-backports main contrib non-free deb-src http://mirror.lzu.edu.cn/debian/ stretch-backports main contrib non-free deb http://mirror.lzu.edu.cn/debian-security/ stretch/updates main contrib non-free deb-src http://mirror.lzu.edu.cn/debian-security/ stretch/updates main contrib non-free
上海交大镜像站
deb https://mirror.sjtu.edu.cn/debian/ stretch main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ stretch main contrib non-free deb https://mirror.sjtu.edu.cn/debian/ stretch-updates main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ stretch-updates main contrib non-free deb https://mirror.sjtu.edu.cn/debian/ stretch-backports main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian/ stretch-backports main contrib non-free deb https://mirror.sjtu.edu.cn/debian-security/ stretch/updates main contrib non-free deb-src https://mirror.sjtu.edu.cn/debian-security/ stretch/updates main contrib non-free
最后附上官方全球镜像站列表地址https://www.debian.org/mirror/list