install script updates 2

setup/install_ardupilot.sh

@@ -67,13 +67,10 @@ cd "$ARDUPILOT_HOME"
 Tools/environment_install/install-prereqs-ubuntu.sh -y
 . ~/.profile || true
 
-# Source ArduPilot environment (includes venv with empy)
+# Source ArduPilot environment (created by install-prereqs-ubuntu.sh)
 if [ -f "$HOME/.ardupilot_env" ]; then
     source "$HOME/.ardupilot_env"
 fi
-if [ -f "$HOME/venv-ardupilot/bin/activate" ]; then
-    source "$HOME/venv-ardupilot/bin/activate"
-fi
 
 # Build ArduCopter SITL (without DDS to avoid complexity)
 ./waf configure --board sitl