Hello everyone please help. I have installed ubuntu 12.04, then ROS Hydro with gazebo on lenovo laptop but Gazebo is not working. it doesn't show any errors, seems that everything is working fine. I tried gzserver and gzclient and its working without errors, gazebo window is shown but I can't do anything in it. its freezing and there is no mesh ground in it. I formatted everything then installed it again but got same problem. can this be related to hardware? its a cheap lenovo laptop. how to solve this, please?