适用于Proxmox VE 8.x更换源，SSH登录到pve后台，然后执行命令。

可以先备份一下系统的订阅源

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mkdir /etc/apt/sources_backup
cp /etc/apt/sources.list /etc/apt/sources_backup/sources.list.bak
cp /etc/apt/sources.list.d/ceph.list /etc/apt/sources_backup/ceph.list.bak
cp /etc/apt/sources.list.d/pve-enterprise.list /etc/apt/sources_backup/pve-enterprise.list.bak

1.设置 中科大源 PVE 8.x

直接编辑：

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# 编辑 sources.list 源文件，写入国内源
nano /etc/apt/sources.list

# 系统自带
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

# 科大源
deb https://mirrors.ustc.edu.cn/debian bookworm main contrib
deb https://mirrors.ustc.edu.cn/debian bookworm-updates main contrib
deb-src https://mirrors.ustc.edu.cn/debian bookworm main contrib
deb-src https://mirrors.ustc.edu.cn/debian bookworm-updates main contrib
# 编辑文件 pve-no-subscription.list
nano /etc/apt/sources.list.d/pve-no-subscription.list
# security updates
deb https://mirrors.ustc.edu.cn/proxmox/debian bookworm pve-no-subscription

或者替换：

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# sources.list  
sed -i 's|^deb http://ftp.debian.org|deb https://mirrors.ustc.edu.cn|g' /etc/apt/sources.list
sed -i 's|^deb http://security.debian.org|deb https://mirrors.ustc.edu.cn/debian-security|g' /etc/apt/sources.list
# ceph.list
echo "deb https://mirrors.ustc.edu.cn/proxmox/debian/ceph-quincy bookworm no-subscription" > /etc/apt/sources.list.d/ceph.list
# pve-enterprise.list  
echo "" > /etc/apt/sources.list.d/pve-enterprise.list

2. 删除企业源 PVE 8.x

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rm -rf /etc/apt/sources.list.d/pve-enterprise.list
# deb "https://mirrors.tuna.tsinghua.edu.cn/proxmox/debian/pve bookworm pve-no-subscription" > /etc/apt/sources.list.d/pve-enterprise.list

# echo "deb http://download.proxmox.com/debian/ceph-quincy bookworm no-subscription" > /etc/apt/sources.list.d/ceph.list

3. 下载密钥

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

4. 添加国内镜像源

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echo "deb http://mirrors.ustc.edu.cn/proxmox/debian/pve bookworm pve-no-subscription" >/etc/apt/sources.list.d/pve-install-repo.list
apt update -y && apt dist-upgrade -y