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diff --git a/YakPanel-server/backend/app/api/__pycache__/terminal.cpython-314.pyc b/YakPanel-server/backend/app/api/__pycache__/terminal.cpython-314.pyc
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diff --git a/YakPanel-server/backend/app/api/__pycache__/user.cpython-314.pyc b/YakPanel-server/backend/app/api/__pycache__/user.cpython-314.pyc
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diff --git a/YakPanel-server/backend/app/api/public_installer.py b/YakPanel-server/backend/app/api/public_installer.py
index 2574d559..7e036720 100644
--- a/YakPanel-server/backend/app/api/public_installer.py
+++ b/YakPanel-server/backend/app/api/public_installer.py
@@ -13,7 +13,6 @@ from collections import defaultdict
 from typing import Annotated, Any, Literal, Optional, Union
 from urllib.parse import urlparse
 
-import asyncssh
 from fastapi import APIRouter, HTTPException, Request, WebSocket
 from pydantic import BaseModel, Field, field_validator
 
@@ -198,6 +197,8 @@ async def create_job(body: CreateJobRequest, request: Request):
     auth_payload = body.auth
 
     async def runner() -> None:
+        import asyncssh
+
         async with _jobs_lock:
             job = _jobs.get(job_id)
         if not job:
diff --git a/YakPanel-server/backend/app/core/__pycache__/config.cpython-314.pyc b/YakPanel-server/backend/app/core/__pycache__/config.cpython-314.pyc
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diff --git a/YakPanel-server/backend/app/services/__pycache__/site_service.cpython-314.pyc b/YakPanel-server/backend/app/services/__pycache__/site_service.cpython-314.pyc
new file mode 100644
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diff --git a/YakPanel-server/install.sh b/YakPanel-server/install.sh
index bc78e8e4..80e2daad 100644
--- a/YakPanel-server/install.sh
+++ b/YakPanel-server/install.sh
@@ -100,7 +100,8 @@ install_base_packages() {
     apt)
       apt-get update -qq
       DEBIAN_FRONTEND=noninteractive apt-get install -y \
-        git python3 python3-venv python3-pip redis-server nginx curl ca-certificates
+        git python3 python3-venv python3-pip python3-dev build-essential \
+        redis-server nginx curl ca-certificates
       ;;
     dnf|yum)
       if [ "$PKG" = dnf ]; then
@@ -119,27 +120,29 @@ install_base_packages() {
   esac
 }
 
-ensure_python_min_311() {
-  if command -v python3.11 >/dev/null 2>&1; then
-    if python3.11 -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 11) else 1)' 2>/dev/null; then
-      PYTHON_CMD=python3.11
-      return 0
-    fi
+# Default dist Python (3.10+ on Ubuntu 22.04) is enough; otherwise install 3.11 from apt.
+ensure_python_for_backend() {
+  if [ -n "${PYTHON_CMD:-}" ]; then
+    return 0
   fi
-  if python3 -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 11) else 1)' 2>/dev/null; then
+  if python3 -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 10) else 1)' 2>/dev/null; then
     PYTHON_CMD=python3
     return 0
   fi
+  if command -v python3.11 >/dev/null 2>&1 && python3.11 -c 'import sys; raise SystemExit(0 if sys.version_info >= (3, 10) else 1)' 2>/dev/null; then
+    PYTHON_CMD=python3.11
+    return 0
+  fi
   if [ "$PKG" = apt ]; then
-    echo "Python 3.11+ required for the backend; installing python3.11 from apt..."
+    echo "Python 3.10+ required for the backend; installing python3.11 from apt..."
     DEBIAN_FRONTEND=noninteractive apt-get install -y python3.11 python3.11-venv python3.11-dev || {
-      echo "Could not install python3.11. Use Ubuntu 24.04+, enable universe, or install Python 3.11+ manually."
+      echo "Could not install python3.11. Enable universe or install Python 3.10+ manually."
       exit 1
     }
     PYTHON_CMD=python3.11
     return 0
   fi
-  echo "Python 3.11+ required. Current: $(python3 -V 2>/dev/null || echo 'python3 missing')"
+  echo "Python 3.10+ required. Current: $(python3 -V 2>/dev/null || echo 'python3 missing')"
   exit 1
 }
 
@@ -189,6 +192,7 @@ stage_source_to_install_path() {
 }
 
 install_base_packages
+ensure_python_for_backend
 ensure_node_18_plus
 
 echo ""
@@ -234,6 +238,10 @@ cd "$INSTALL_PATH/backend"
 # shellcheck source=/dev/null
 source venv/bin/activate
 pip install -q -r requirements.txt
+./venv/bin/python -c "import app.main" || {
+  echo "ERROR: Backend failed to import (see traceback above). Check Python version and requirements."
+  exit 1
+}
 python scripts/seed_admin.py
 deactivate
 
@@ -281,6 +289,7 @@ Type=simple
 User=root
 WorkingDirectory=$INSTALL_PATH/backend
 Environment="PATH=$INSTALL_PATH/backend/venv/bin:\$PATH"
+Environment=PYTHONUNBUFFERED=1
 ExecStart=$INSTALL_PATH/backend/venv/bin/uvicorn app.main:app --host 127.0.0.1 --port $BACKEND_PORT
 Restart=always
 RestartSec=3
@@ -294,7 +303,7 @@ systemctl enable "$SYSTEMD_UNIT"
 systemctl restart "$SYSTEMD_UNIT" || systemctl start "$SYSTEMD_UNIT"
 
 backend_ok=0
-for _ in {1..40}; do
+for _ in {1..120}; do
   if curl -sfS --max-time 2 "http://127.0.0.1:${BACKEND_PORT}/api/health" >/dev/null 2>&1; then
     backend_ok=1
     break