首先说一下什么是源？

我们下载一些软件资料什么的都是需要从一些站点去下载的，Linux操作系统的源可以理解为资料下载的服务器对你提供的地址。

下载或者软件更新的时候是要从指定源站点去下载或者更新的。

为什么要给Linux换源？（没有人规定非要换源）

换源的大部分原因是Linux系统自带的官方源是国外源，也就是我们需要访问国外的服务器来更新包，访问速度是非常慢的，而且失败的概率很大。使用中科大、阿里、网易等源速度飞快。

换源的步骤如下：

1.首先找到源的配置文件

cd   /etc/apt

2.对配置文件进行备份

cp  sources.list  sources.list.bak

3.修改源配置文件（sources.list）

 国内源在哪里：直接百度即可找到

​
# 中科大
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# 阿里源
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb 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 main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

​

vi sources.list

 复制粘贴即可然后保存即可。

更新软件列表：sudo apt-get update

进行软件更新：sudo apt-get upgrade