清华源
大部分 Debian 的软件源配置文件使用传统的 One-Line-Style，路径为 /etc/apt/sources.list；但是对于容器镜像，从 Debian 12 开始，其软件源配置文件变更为 DEB822 格式，路径为 /etc/apt/sources.list.d/debian.sources。一般情况下，将对应文件中 Debian 默认的源地址 http://deb.debian.org/ 替换为镜像地址即可。
Debian Buster 以上版本默认支持 HTTPS 源。如果遇到无法拉取 HTTPS 源的情况，请先使用 HTTP 源并安装：
apt install apt-transport-https ca-certificates传统格式（/etc/apt/sources.list）
注释掉的deb-src是源码源，有需要可以自己取消注释
安全源二选一即可，模式使用官方的安全源
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie main contrib non-free non-free-firmware
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-updates main contrib non-free non-free-firmware
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-updates main contrib non-free non-free-firmware
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-backports main contrib non-free non-free-firmware
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ trixie-backports main contrib non-free non-free-firmware
# 以下安全更新软件源为官方源配置
deb https://security.debian.org/debian-security trixie-security main contrib non-free non-free-firmware
# deb-src https://security.debian.org/debian-security trixie-security main contrib non-free non-free-firmware
# 以下安全更新软件源为镜像站配置
# deb https://mirrors.tuna.tsinghua.edu.cn/debian-security trixie-security main contrib non-free non-free-firmware
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security trixie-security main contrib non-free non-free-firmware配置完后执行
sudo apt updateDEB822 格式（/etc/apt/sources.list.d/debian.sources）
Types: deb
URIs: https://mirrors.tuna.tsinghua.edu.cn/debian
Suites: trixie trixie-updates trixie-backports
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
# Types: deb-src
# URIs: https://mirrors.tuna.tsinghua.edu.cn/debian
# Suites: trixie trixie-updates trixie-backports
# Components: main contrib non-free non-free-firmware
# Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
# 以下安全更新软件源为官方源配置
Types: deb
URIs: https://security.debian.org/debian-security
Suites: trixie-security
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
# Types: deb-src
# URIs: https://security.debian.org/debian-security
# Suites: trixie-security
# Components: main contrib non-free non-free-firmware
# Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg