由于Debian12默认安装的源要么是光盘源，要么是国外源，速度保障都差强人意。所以安装完系统的第一步就是把源更换为国内源。
nano /etc/apt/sources.list
退出保存后执行：
sudo apt-get update
sudo apt-get upgrade
Debian全球镜像站列表：https://www.debian.org/mirror/list
阿里云站点
deb https://mirrors.aliyun.com/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.aliyun.com/debian-security/ bookworm-security main
deb-src https://mirrors.aliyun.com/debian-security/ bookworm-security main
deb https://mirrors.aliyun.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.aliyun.com/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.aliyun.com/debian/ bookworm-backports main non-free non-free-firmware contrib
腾讯云站点
deb https://mirrors.cloud.tencent.com/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.cloud.tencent.com/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.cloud.tencent.com/debian-security/ bookworm-security main
deb-src https://mirrors.cloud.tencent.com/debian-security/ bookworm-security main
deb https://mirrors.cloud.tencent.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.cloud.tencent.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.cloud.tencent.com/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.cloud.tencent.com/debian/ bookworm-backports main non-free non-free-firmware contrib
清华大学站点
deb https://mirrors.tsinghua.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.tsinghua.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.tsinghua.edu.cn/debian-security/ bookworm-security main
deb-src https://mirrors.tsinghua.edu.cn/debian-security/ bookworm-security main
deb https://mirrors.tsinghua.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.tsinghua.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.tsinghua.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.tsinghua.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
中科大站点
deb https://mirrors.ustc.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.ustc.edu.cn/debian-security/ bookworm-security main
deb-src https://mirrors.ustc.edu.cn/debian-security/ bookworm-security main
deb https://mirrors.ustc.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.ustc.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.ustc.edu.cn/debian/ bookworm-backports main non-free non-free-firmware contrib
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