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#vim /etc/apt/sources.list
deb https://mirrors.ustc.edu.cn/debian bookworm main contrib
deb https://mirrors.ustc.edu.cn/debian bookworm-updates main contrib
# security updates
deb https://mirrors.ustc.edu.cn/debian-security bookworm-security main contrib
#vim /etc/apt/sources.list.d/pve-no-subscription.list
deb https://mirrors.ustc.edu.cn/proxmox/debian/pve bookworm pve-no-subscription