Debian 10.3 下载地址：

http://mirrors.163.com/debian-cd/10.3.0-live/amd64/iso-hybrid/debian-live-10.3.0-amd64-standard.iso

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备份

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

更换

vim /etc/apt/sources.list

输入以下内容：

注意权限问题，否则可能编辑不了此文件。

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

更新

apt-get update
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