第一步：安装vim

    1. sudo apt-get install vim

    第二步：编辑配置文件

    1. sudo vim /etc/apt/sources.list

    第三步：替换里面的内容
    参考：https://developer.aliyun.com/mirror/ubuntu?spm=a2c6h.13651102.0.0.3e221b11KVnr4O

    1. deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
    2. deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
    4. deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
    5. deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
    7. deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
    8. deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
    10. deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
    11. deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
    13. deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
    14. deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

    第四步：更新

    1. sudo apt-get update
    3. sudo apt-get upgrade