nano /etc/apt/sources.list
#中科大源(IPv4&IPv6)
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
#清华源(IPv4&IPv6)
deb https://mirror.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb-src https://mirror.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb https://mirror.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb-src https://mirror.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirror.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb-src https://mirror.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirror.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main contrib non-free
deb-src https://mirror.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main contrib non-free
#Amazon源(IPv4&IPv6&CDN)
deb https://cdn-aws.deb.debian.org/debian/ stretch main contrib non-free
deb-src https://cdn-aws.deb.debian.org/debian/ stretch main contrib non-free
deb https://cdn-aws.deb.debian.org/debian/ stretch-updates main contrib non-free
deb-src https://cdn-aws.deb.debian.org/debian/ stretch-updates main contrib non-free
deb https://cdn-aws.deb.debian.org/debian/ stretch-backports main contrib non-free
deb-src https://cdn-aws.deb.debian.org/debian/ stretch-backports main contrib non-free
deb https://cdn-aws.deb.debian.org/debian-security/ stretch/updates main contrib non-free
deb-src https://cdn-aws.deb.debian.org/debian-security/ stretch/updates main contrib non-free