Win10 Windows Store中下载的WSL Ubuntu 18.04默认的源apt install下载速度异常缓慢，想替换成内部阿里云的替代源。
确认默认源
首先查看默认的源的地址
sudo vim /etc/apt/sources.list
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://archive.ubuntu.com/ubuntu/ bionic universe
deb http://archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://archive.ubuntu.com/ubuntu/ bionic-updates universe
...
修改默认源
首先将原配置文件备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.20181013
然后VIM ：，替换
:%s/security.ubuntu/mirrors.aliyun/g
:%s/archive.ubuntu/mirrors.aliyun/g
更新
sudo apt update
再使用apt install速度就快多了
参考
https://mirrors.aliyun.com/about
https://www.sunzhongwei.com/modify-the-wsl-ubuntu-1804-default-source-for-ali-cloud-images