Install Scripts Update

docs/installation.md

@@ -222,6 +222,23 @@ nvidia-smi
 # PyBullet will use hardware rendering automatically
 ```
 
+**Install Gazebo (optional):**
+
+If you want to use Gazebo simulation:
+```bash
+# Install ros-gz bridge
+sudo apt install ros-humble-ros-gz
+
+# Install Gazebo Fortress (provides 'ign' command)
+sudo apt install gz-fortress
+
+# Verify - one of these should work:
+gz sim --version      # Newer Gazebo
+ign gazebo --version  # Fortress (ROS 2 Humble)
+```
+
+**Note:** ROS 2 Humble uses Gazebo Fortress, which uses `ign gazebo` command instead of `gz sim`. The launch file auto-detects which command is available.
+
 **Troubleshooting WSL GUI:**
 
 If GUI doesn't work: