Ubuntu16.04 换阿里源

1、在实际操作前需要搞懂几个概念，比如Ubuntu的代号

16.04(LTS) Xenial Xerus (好客的非洲地松鼠)
16.10 Yakkety Yak（牦牛）
17.04 Zesty Zapus(开心的跳鼠)
18.04(LTS) Bionic Beaver（仿生海狸）

.....

查看当前系统的代号：lsb_release -a

2、到阿里源镜像地址查找到相应代号

http://mirrors.aliyun.com/ubuntu/dists/

3、输入以下命令备份原来的源

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

4、再输入以下命令打开sources.list配置文件更换源

sudo vim/etc/apt/sources.list //配置内容如下
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
 deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse

5、再输入命令更新源

sudo apt-get update