debian apt 更改阿里源

1. 备份文件

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

2. 更改 sources.list文件内容为：

   deb http://mirrors.aliyun.com/debian/ buster main non-free contrib
   deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib
   deb http://mirrors.aliyun.com/debian-security buster/updates main
   deb-src http://mirrors.aliyun.com/debian-security buster/updates main
   deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
   deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
   deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
   deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib

3. 更新

apt-get update -y