Ubuntu通过终端命令行换阿里源

1. 检查Ubuntu系统的Codename

   $ lsb_release -a
   

   得到结果:

   No LSB modules are available.
   Distributor ID: Ubuntu
   Description:    Ubuntu 18.04.2 LTS
   Release:        18.04
   Codename:       bionic
   

   访问http://mirrors.aliyun.com/ubuntu/dists/查看阿里源是否支持

2. 修改sources.list

   $ sudo vi /etc/apt/sources.list
   

   删除sources.list中原有的内容，更换为阿里源

   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
   

   注意此处每一行的bionic都需要与系统的Codename相对应，因此不同系统版本间的sources.list文件不能通用

3. 更新yuan

   $ sudo apt-get update
   

4. 更新软件

   $ sudo apt-get upgrade