Ubuntu 18.04换国内源

参考文档： https://blog.csdn.net/zhangjiahao14/article/details/80554616 http://www.javashuo.com/article/p-gkiadycb-gk.html

1.复制源文件备份，以防万一

咱们要修改的文件是sources.list，它在目录/etc/apt/下，sources.list是包管理工具apt所用的记录软件包仓库位置的配置文件，一样类型的还有位于 同目录下sources.list.d文件下的各类.list后缀的各文件。

命令以下：

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2.编辑源列表文件

命令以下：

sudo vim /etc/apt/sources.list

3.查看新版本信息

其实Ubuntu18.04版以前的任一版更改apt源为国内源方法早就有了，内容大同小异，咱们应当掌握其规律了，其实每一版内容不一样的地方就是版本号（或者官方一点的说：系统代号），因此咱们先了解下新版本的系统代号：

使用以下命令：

lsb_release -c

获得本系统的系统代号，以下图所示：

咱们能够看到新版本的Ubuntu系统代号为bionic 一样的咱们也能够获得以前任意版本的系统代号:

• Ubuntu 12.04 (LTS)代号为precise。
• Ubuntu 14.04 (LTS)代号为trusty。
• Ubuntu 15.04 代号为vivid。
• Ubuntu 15.10 代号为wily。
• Ubuntu 16.04 (LTS)代号为xenial。

因此这也就解释了为何咱们百度出来的那么多方案里面内容不尽相同的缘由，由于他们更改apt安装源时用的系统不同。

4. 修改源

将原有的内容注释掉，添加如下内容（或者你把里面内容修改为下面的就能够，可是不能有除了如下内容的有效内容, 注意，下面给的几个源，选一个就好）

## 中科大源

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

## 163源

deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

## 清华源

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

5. 更新软件列表

运行以下命令：

sudo apt-get update

6. 更新软件包

运行以下命令：

sudo apt-get upgrade