由於Debian 10（buster）還比較新，有很多源都使用不了，有的還連接不上，以下是親自試過可以使用的源，需要的小夥伴可以試試。
163源
# deb cdrom:[Debian GNU/Linux 10.2.0 _Buster_ - Official i386 NETINST 20191116-11:32]/ buster main
#deb cdrom:[Debian GNU/Linux 10.2.0 _Buster_ - Official i386 NETINST 20191116-11:32]/ buster main
deb http://mirrors.163.com/debian/ buster main
deb-src http://mirrors.163.com/debian/ buster main
deb http://security.debian.org/debian-security buster/updates main
deb-src http://security.debian.org/debian-security buster/updates main
# buster-updates, previously known as 'volatile'
deb http://mirrors.163.com/debian/ buster-updates main
deb-src http://mirrors.163.com/debian/ buster-updates main
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
阿里源
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
步驟：
- 備份/etc/apt/sources.list，備份命令
cp /etc/apt/sources.list /etc/apt/sources.list.bak
2.在/etc/apt/sources.list文件中，刪除原文件所有內容，添加上面的條目。
注：/etc/apt/sources.list 是包管理工具 apt 所用的記錄軟件包倉庫位置的配置文件
其中，deb：檔案類型爲二進制預編譯軟件包，一般我們所用的檔案類型。
deb-src：檔案類型爲用於編譯二進制軟件包的源代碼
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