Fix Install Scripts

setup/install_ubuntu.sh

@@ -183,11 +183,17 @@ if [ -f "$HOME/.ardupilot_env" ]; then
     echo "[OK] ArduPilot environment"
 fi
 
+# Deactivate any existing venv to avoid conflicts
+if [ -n "$VIRTUAL_ENV" ]; then
+    deactivate 2>/dev/null || true
+fi
+
 # Activate ArduPilot venv (has empy and other dependencies)
+# This is preferred over project venv for ArduPilot compatibility
 if [ -f "$HOME/venv-ardupilot/bin/activate" ]; then
     source "$HOME/venv-ardupilot/bin/activate"
     echo "[OK] ArduPilot venv"
-# Fallback to project venv
+# Fallback to project venv only if ArduPilot not installed
 elif [ -f "$SCRIPT_DIR/venv/bin/activate" ]; then
     source "$SCRIPT_DIR/venv/bin/activate"
     echo "[OK] Python venv"