Ubuntu换国内源

1. 首先你最初安装好的ubuntu虚拟机是默认安装的是国外的源，导致你下载和更新软件会非常的慢！！！！所以我们需要换到我们国内的源，比如阿里源，清华源，网易源等等，这样你就会发现新的世界，国内源，谁用谁知道

2. 下面介绍如何将Ubuntu换成国内的源

   # 备份原来的源并且另存
   sudo cp -v /etc/apt/sources.list /etc/apt/sources.list.backup
   
   # 执行chmod命令更改文件权限使软件源文件可编辑
   sudo chmod 777 /etc/apt/sources.list
   
   # 通过gedit命令编辑软件源：
   sudo gedit /etc/apt/sources.list
   
   # 执行上面命令后如果报sudo: gedit: command not found的错误，执行下面命令
   sudo apt install vim
   vim /etc/apt/sources.list
   
   

   3. 打开源文件后，按 i 进入编辑模式将所有的代码删干净，然后复制粘贴你需要的镜像源，先按ECS键退出编辑，然后使用 :wq 命令退出编辑模式
   4. 换完源之后执行以下命令

   sudo apt update
   sudo apt upgrade
   

   5. 备上部分国内源Ubuntu
   • 阿里源

   deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
   deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
   deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multivers
   deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
   deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
   

   • 网易源

   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
   

   • 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
   

   • 清华源

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