# Ubuntu系統軟件源更換
## 什么是Ubuntu的軟件源？
我們在使用Debian或者Ubuntu的apt-get工具來安裝需要的軟件時，其實就是從服務器獲取需要安裝的軟件并把它安裝在本地計算機的過程。所謂的軟件源，就是我們獲取軟件的來源，它是定義在/etc/apt/sources.list文件里的。
<br>
Ubuntu系統自帶的源都是國外的網址，國內用戶在使用的時候網速比較慢。一個軟件的下載等待時間很漫長，這里講解一下如何將國外源更換為國內源，讓你的網速快的飛起。
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這里推薦使用阿里云軟件源：https://developer.aliyun.com/mirror/ubuntu?spm=a2c6h.13651102.0.0.3e221b11mDAe5z
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## 配置方法一：圖形界面配置
推薦**新手**使用圖形界面配置： 系統設置 -> 軟件和更新 選擇下載服務器 -> "mirrors.aliyun.com"
## 配置方法二：手動更改
用你熟悉的編輯器打開：
```
/etc/apt/sources.list
```
替換默認的
```
http://archive.ubuntu.com/
```
為
```
mirrors.aliyun.com
```
下面列舉一些Ubuntu常用系統的配置項，可以直接**復制替換** /etc/apt/sources.list 文件中的內容。
### 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
```
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Enjoy it.
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