deb http://ftp.debian.org/debian bookworm main contrib

deb http://ftp.debian.org/debian bookworm-updates main contrib

security updates

deb http://security.debian.org bookworm-security main contrib

Proxmox VE pve-no-subscription repository provided by proxmox.com,

NOT recommended for production use

deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription

deb http://mirrors.ustc.edu.cn/debian bookworm main contrib non-free-firmware
deb http://mirrors.ustc.edu.cn/debian bookworm-updates main contrib non-free-firmware
deb http://mirrors.ustc.edu.cn/debian-security bookworm-security main contrib non-free-firmware
deb https://mirrors.ustc.edu.cn/proxmox/debian/pve bookworm pve-no-subscription