I've recently been introduced to SITL recently and have following this
After all the package installations, when I go into th /ardupilot/ArduCopter/ director theres no sim_vehicle python file as the doc suggests. I did however find the file at /home/$USER/ardupilot/Tools/autotest/ after which I was able to get the simulator running.
I followed the instructions to point and have made sure that no one was left.
Wanted to know what the reason for this be. Any help is appreciated
EDIT: Corrected Hyperlink