https://docs.arduino.cc/tutorials/portenta-x8/python-arduino-data-exchange/
sudo docker-compose should be: sudo docker compose
Hello @vincenzo! If you see something wrong in the tutorials on Arduino Docs, you are more than welcome to open an issue in the repository. This way, it becomes easier for the team to implement a fix!
You are also more than welcome to make your own contribution as a pull request, and we will tag the relevant reviewers 
Hello Vincenzo,
We have been updating these tutorials during the last weeks, now the tutorial should be using "sudo docket compose" Thank you for noticing.
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