ubuntn替换源

1.查看版本代号：

使用如下命令：

lsb_release -c

得到本系统的系统代号

Ubuntu 14.04 (LTS)代号为trusty。

Ubuntu 16.04 (LTS)代号为xenial

Ubuntu 18.04 (LTS)代号为bionic

2.备份源文件

命令如下：

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

3.编辑源列表文件

使用命令：

sudo vim /etc/apt/sources.list

如果报错：sudo:vim:command not found    说明没装vim编辑器

使用命令：

sudo apt-get install vim 安装即可

4.更换源

原有内容全部注释，添加

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-backports main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports 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

5.更新软件列表

运行如下命令：

sudo apt-get update

6.更新软件包

运行如下命令：

sudo apt-get upgrade