前篇我们介绍了 Windows 10启用Linux子系统（WSL） 图文教程， 但是这里的apt源是官方的源，在国内更新比较慢。所以我们这里记录一下如何更换debian9的apt源。
编辑apt源文件
/etc/apt/sources.list
阿里云apt源
deb http://mirrors.aliyun.com/debian stretch main contrib non-free
deb-src http://mirrors.aliyun.com/debian stretch main contrib non-free
deb http://mirrors.aliyun.com/debian stretch-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian stretch-updates main contrib non-free
deb http://mirrors.aliyun.com/debian-security stretch/updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian-security stretch/updates main contrib non-free
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你也可以把”Stretch”换成”jessie”,”wheezy”。分别对应Debian9，Debian8，Debian7版本。
如何查询自己的Linux版本参考如下：
cat /etc/issue
更新apt源
apt-get update
通过终端窗口的信息就可以看出来，此时请求的就是阿里云的镜像。