mv /etc/apt/sources.list /etc/apt/sources.list.bak
mv /etc/apt/sources.list.d/debian.sources /etc/apt/sources.list.d/debian.sources.bak

sudo tee /etc/apt/sources.list.d/debian.sources <<EOF
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

EOF

root@debian:~# apt clean && apt update
Hit:1 https://mirrors.tuna.tsinghua.edu.cn/debian trixie InRelease
Get:2 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-updates InRelease [47.3 kB]
Get:3 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports InRelease [54.0 kB]
Get:4 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Sources.diff/Index [63.3 kB]
Get:5 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main amd64 Packages.diff/Index [63.3 kB]
Get:6 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Translation-en.diff/Index [63.3 kB]
Hit:7 https://mirrors.aliyun.com/docker-ce/linux/debian trixie InRelease
Get:8 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Sources T-2026-05-03-2012.10-F-2026-05-03-1425.26.pdiff [2,320 B]
Get:9 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main amd64 Packages T-2026-05-04-0220.06-F-2026-05-03-1425.26.pdiff [2,325 B]
Get:8 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Sources T-2026-05-03-2012.10-F-2026-05-03-1425.26.pdiff [2,320 B]
Get:9 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main amd64 Packages T-2026-05-04-0220.06-F-2026-05-03-1425.26.pdiff [2,325 B]
Get:10 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Translation-en T-2026-05-03-1425.26-F-2026-05-03-1425.26.pdiff [616 B]
Get:10 https://mirrors.tuna.tsinghua.edu.cn/debian trixie-backports/main Translation-en T-2026-05-03-1425.26-F-2026-05-03-1425.26.pdiff [616 B]
Hit:11 https://security.debian.org/debian-security trixie-security InRelease
Fetched 297 kB in 2s (137 kB/s)
All packages are up to date.
root@debian:~#