debian9换源存在的问题

今天租借了云服务器搭建了debian9，给apt-get换源过程中出现了很多问题，主要有两个问题：

• 问题1：

sudo apt-get update
0% [Working]

• 问题2：

W: The repository 'http://mirrors.aliyun.com/debian stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://mirrors.aliyun.com/debian-security stretch/updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://mirrors.aliyun.com/debian stretch-updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://mirrors.aliyun.com/debian stretch-backports Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://mirrors.aliyun.com/debian/dists/stretch/non-free/source/Sources  404  Not Found [IP: 106.116.170.186 80]
E: Failed to fetch http://mirrors.aliyun.com/debian-security/dists/stretch/updates/main/source/Sources  404  Not Found [IP: 106.116.170.186 80]
E: Failed to fetch http://mirrors.aliyun.com/debian/dists/stretch-updates/non-free/source/Sources  404  Not Found [IP: 106.116.170.186 80]
E: Failed to fetch http://mirrors.aliyun.com/debian/dists/stretch-backports/contrib/source/Sources  404  Not Found [IP: 106.116.170.186 80]

出现这两个的主要问题就是使用csdn的一些文章推荐的，但是这些都有问题，包括阿里云自己的地址都没有更新，但是下面有一个评论更新了新的地址：

deb http://mirrors.aliyun.com/debian-archive/debian stretch main contrib non-free
deb http://mirrors.aliyun.com/debian-archive/debian stretch-backports main
deb http://mirrors.aliyun.com/debian-archive/debian-security stretch/updates main
deb-src http://mirrors.aliyun.com/debian-archive/debian stretch main
deb-src http://mirrors.aliyun.com/debian-archive/debian stretch-backports main
deb-src http://mirrors.aliyun.com/debian-archive/debian-security stretch/updates main

请大家一定要去阿里的官网看一哈评论：阿里镜像官网