Debian12系统国内源更换指南
备份当前源列表
cp /etc/apt/sources.list /etc/apt/sources.list.backup
编辑器编辑 /etc/apt/sources.list 文件：
nano /etc/apt/sources.list
修改为清华大学源：
#第一条注释掉 # 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/ bookworm main contrib non-free non-free-firmware # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm main contrib non-free non-free-firmware deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-updates main contrib non-free non-free-firmware # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-updates main contrib non-free non-free-firmware deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-backports main contrib non-free non-free-firmware # deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-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 bookworm-security main contrib non-free non-free-firmware # deb-src https://security.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware
修改完源后，运行以下命令来更新你的软件包列表：
apt update
为了节省空间，你可以清理旧的软件包：
sudo apt autoremove sudo apt autoclean