diff --git a/setup.sh b/setup.sh
index 6308efc..d464002 100644
--- a/setup.sh
+++ b/setup.sh
@@ -15,7 +15,7 @@ apt-get install -y python3 python3-venv python3-pip git ffmpeg rsync curl gnupg
 echo "安装并启动 MongoDB..."
 MONGO_READY=false
 if ! command -v mongod >/dev/null 2>&1; then
-  if [ -n "$CODENAME" ]; then
+  if [ -n "$CODENAME" ] && echo "$CODENAME" | grep -Eq '^(focal|jammy)$'; then
     curl -fsSL https://pgp.mongodb.com/server-7.0.asc | gpg --dearmor -o /usr/share/keyrings/mongodb-server-7.0.gpg || true
     echo "deb [ signed-by=/usr/share/keyrings/mongodb-server-7.0.gpg ] https://repo.mongodb.org/apt/ubuntu ${CODENAME}/mongodb-org/7.0 multiverse" > /etc/apt/sources.list.d/mongodb-org-7.0.list || true
     if apt-get update -y; then
@@ -25,7 +25,8 @@ if ! command -v mongod >/dev/null 2>&1; then
     fi
   fi
   if [ "$MONGO_READY" = false ]; then
-    echo "APT 仓库不可用，改用 Docker 部署 MongoDB..."
+    echo "APT 仓库不可用或版本不支持，改用 Docker 部署 MongoDB..."
+    rm -f /etc/apt/sources.list.d/mongodb-org-7.0.list || true
     apt-get install -y docker.io
     systemctl enable --now docker || true
     mkdir -p /var/lib/mongo
@@ -43,7 +44,7 @@ if ! command -v mongod >/dev/null 2>&1; then
 else
   MONGO_READY=true
 fi
-if [ "$MONGO_READY" = true ]; then
+if [ "$MONGO_READY" = true ] && systemctl list-unit-files | grep -q '^mongod\.service'; then
   systemctl enable mongod || true
   systemctl restart mongod || systemctl start mongod || true
 fi