diff --git a/build_backend.sh b/build_backend.sh
index ba5fb1a..e271799 100644
--- a/build_backend.sh
+++ b/build_backend.sh
@@ -18,8 +18,9 @@ else
     _green "资源池 $POOL_ID 已创建！"
 fi
 
-# 安装必备模块并删除apt源中的无效订阅
-rm -f /etc/apt/sources.list.d/pve-enterprise.list
+# 安装必备模块并替换apt源中的无效订阅
+cp /etc/apt/sources.list.d/pve-enterprise.list /etc/apt/sources.list.d/pve-enterprise.list.bak
+echo "deb http://download.proxmox.com/debian/pve $(lsb_release -sc) pve-no-subscription" > /etc/apt/sources.list.d/pve-enterprise.list
 apt-get update
 install_required_modules() {
     modules=("sudo" "ifupdown2" "lshw" "iproute2" "net-tools" "cloud-init" "novnc" "isc-dhcp-server")