适用于Proxmox VE 7.x更换源，SSH登录到pve后台，然后一条一条的执行命令。

1.处理掉企业源：

rm -rf /etc/apt/sources.list.d/pve-install-repo.list

echo "#deb https://enterprise.proxmox.com/debian/pve Bullseye pve-enterprise" > /etc/apt/sources.list.d/pve-enterprise.list

2.开始换源：

wget https://mirrors.ustc.edu.cn/proxmox/debian/proxmox-release-bullseye.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bullseye.gpg

echo "deb https://mirrors.ustc.edu.cn/proxmox/debian/pve bullseye pve-no-subscription" > /etc/apt/sources.list.d/pve-no-subscription.list

echo "deb https://mirrors.ustc.edu.cn/proxmox/debian/ceph-pacific bullseye main" > /etc/apt/sources.list.d/ceph.list

sed -i.bak "s#http://download.proxmox.com/debian#https://mirrors.ustc.edu.cn/proxmox/debian#g" /usr/share/perl5/PVE/CLI/pveceph.pm

sed -i.bak "s#ftp.debian.org/debian#mirrors.aliyun.com/debian#g" /etc/apt/sources.list

sed -i "s#security.debian.org#mirrors.aliyun.com/debian-security#g" /etc/apt/sources.list

echo "deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription" >>  /etc/apt/sources.list

3.更新：

apt update && apt dist-upgrade -y