Hi! Sorry for the late response, I was a little sick. Upon your recommendation, I did sudo apt upgrade libignition-math2 as well as sudo apt update and sudo apt upgrade. The result is that the error messages are gone. When I run gazebo --verbose worlds/iris_arducopter_runway.world, things seem start moving. However, the actual simulation never
seems to start up. I am left with a strange transparent box in the middle of my screen, along with all the other ardupilot terminal messages. I’ve uploaded the same for your reference. This same strange box is also displayed when I run gazebo on my terminal. Also, gazebo9 is shown as an invalid command. Thanks