在更改源之前，务必删除pve自带的企业源，这个源要收费。

rm -rf /etc/apt/sources.list.d/pve-enterprise.list  

之后按照版本，修改/etc/apt/sources.list文件

6.x版本源

建议同时使用国内debian源

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free


deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free


deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free


deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/proxmox/debian buster pve-no-subscription

7.x版本源

清华源

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/debian-security bullseye-security main contrib non-free

deb https://mirrors.tuna.tsinghua.edu.cn/proxmox/debian bullseye pve-no-subscription

中科大源

• deb https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free

• deb https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free

• deb https://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free

• deb https://mirrors.ustc.edu.cn/debian-security bullseye-security main contrib

• deb https://mirrors.ustc.edu.cn/proxmox/debian bullseye pve-no-subscription