网易163源1：
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
网易163源2：
清华镜像源：
deb https://mirrors.ustc.edu.cn/debian/ unstable main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ experimental main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ buster main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ buster-proposed-updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debian-security/ buster/updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debiancn/ buster main
deb https://mirrors.ustc.edu.cn/deb-multimedia/ buster main non-free
附设置优先权限：
附安装验证：
否则会提示：
错误:7 https://mirrors.ustc.edu.cn/debiancn buster InRelease
由于没有公钥，无法验证下列签名： NO_PUBKEY 0D466E1DA2992C9C
错误:8 https://mirrors.ustc.edu.cn/deb-multimedia buster InRelease
由于没有公钥，无法验证下列签名： NO_PUBKEY 5C808C2B65558117
解决方案：
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0D466E1DA2992C9C
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 5C808C2B65558117
设置优先级：
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