1. 备份原文件
bash
sudo cp /etc/apt/sources.list.d/debian.sources /etc/apt/sources.list.d/debian.sources.bak
sudo cp /etc/apt/sources.list.d/raspi.sources /etc/apt/sources.list.d/raspi.sources.bak
2. 修改系统源
bash
sudo nano /etc/apt/sources.list.d/debian.sources
替换为以下内容（以清华源为例）：
bash
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
Types: deb
URIs: https://mirrors.tuna.tsinghua.edu.cn/debian-security
Suites: trixie-security
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
3. 修改树莓派源
bash
sudo nano /etc/apt/sources.list.d/raspi.sources
替换为：
bash
Types: deb
URIs: https://mirrors.tuna.tsinghua.edu.cn/raspberrypi
Suites: trixie
Components: main
Signed-By: /usr/share/keyrings/raspberrypi-archive-keyring.gpg
4. 更新源
bash
sudo apt update
sudo apt upgrade