sudo vi /etc/opt/source.list 清空原来内容，自选添加以下源：


# 中国科技大学
deb https://mirrors..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