源更改为中科大源

• 请先备份原来然 sources.list 文件

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

• 使用 gedit 打开 /etc/apt/sources.list

  sudo gedit /etc/apt/sources.list
  

• 把 /etc/apt/sources.list 的内容替换为以下内容，保存后关闭

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse

## Not recommended
# deb https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse

• 更新索引以生效

  sudo apt update -y
  

更新系统软件

apt upgrade -y

生成密钥

IP、DNS、HOSTNAME

时间配置

卸载默认的软件

这步根据自己的需求进行操作