Can you please explain what you are trying to do when this screen pops up?
…without any reference it is hard to help you.
I work trying to buildmavproxy and ardupilot. This is referance link https://github.com/Intelligent-Quads/iq_tutorials/blob/master/docs/Installing_Ardupilot.md
Appears you are running a version of Linux.
Which one please?
l 20.04 release version
Use the actual documentation instead of a 4 year old set of notes…
Hi,I used before but dosent work
You are running the command in the wrong directory. 
navigate to >/ardupilot directory and run this command sim_vehicle.py -v ArduCopter
I used but dosent work
Hard to help you if you won’t follow advice (and our own documentation).
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