需求说明：
更新apt-get源
kyeup@kyeup-nas:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.4 (stretch)
Release: 9.4
Codename: stretch
kyeup@kyeup-nas:~$ cat /etc/apt/source-list
# deb cdrom:[Debian GNU/Linux 9.4.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180310-11:21]/ stretch main
#deb cdrom:[Debian GNU/Linux 9.4.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180310-11:21]/ stretch main
#deb http://mirrors.163.com/debian/ stretch main
#deb-src http://mirrors.163.com/debian/ stretch main
#deb http://security.debian.org/debian-security stretch/updates main
#deb-src http://security.debian.org/debian-security stretch/updates main
# stretch-updates, previously known as ‘volatile‘
#deb http://mirrors.163.com/debian/ stretch-updates main
#deb-src http://mirrors.163.com/debian/ stretch-updates main
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配置完成后：
sudo apt-get update
测试。
Debian 9 更新 sourrce.list(163源）
原文：https://www.cnblogs.com/kyeup/p/9286678.html