vim /etc/apt/sources.list-----deb https://mirrors.bfsu.edu.cn/debian/ bookworm main contribdeb https://mirrors.bfsu.edu.cn/debian/ bookworm-updates main contribdeb https://mirrors.bfsu.edu.cn/debian/ bookworm-backports main contribdeb https://mirrors.bfsu.edu.cn/debian-security bookworm-security main contribdeb https://mirrors.bfsu.edu.cn/proxmox/debian/pbs bookworm pbs-no-subscription-----