# Ubuntu系统软件源更换
## 什么是Ubuntu的软件源？
我们在使用Debian或者Ubuntu的apt-get工具来安装需要的软件时，其实就是从服务器获取需要安装的软件并把它安装在本地计算机的过程。所谓的软件源，就是我们获取软件的来源，它是定义在/etc/apt/sources.list文件里的。
<br>
Ubuntu系统自带的源都是国外的网址，国内用户在使用的时候网速比较慢。一个软件的下载等待时间很漫长，这里讲解一下如何将国外源更换为国内源，让你的网速快的飞起。
<br>
这里推荐使用阿里云软件源：https://developer.aliyun.com/mirror/ubuntu?spm=a2c6h.13651102.0.0.3e221b11mDAe5z
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## 配置方法一：图形界面配置
推荐**新手**使用图形界面配置： 系统设置 -> 软件和更新 选择下载服务器 -> "mirrors.aliyun.com"
## 配置方法二：手动更改
用你熟悉的编辑器打开：
```
/etc/apt/sources.list
```
替换默认的
```
http://archive.ubuntu.com/
```
为
```
mirrors.aliyun.com
```
下面列举一些Ubuntu常用系统的配置项，可以直接**复制替换** /etc/apt/sources.list 文件中的内容。
### ubuntu 16.04 配置如下
```
deb http://mirrors.aliyun.com/ubuntu/ xenial main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe
```
<br>
### ubuntu 18.04 配置如下
```
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
```
<br>
### ubuntu 20.04(focal) 配置如下
```
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
```
<br>
Enjoy it.
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