I get this error message when trying to upload any thing to ItsyBitsy M0 Express.
I tried to google but did not find a solution: “/bin/arm-none-eabi-g++”: file does not exist
https://forum.arduino.cc/t/exec-bin-arm-none-eabi-g-file-does-not-exist/635591
I added this text in the text file extra:
https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
Now when I open I see this:
http://arduino.esp8266.com/stable/package_esp8266com_index.json
https://adafruit.github.io/arduino-board-index/package_adafruit_index.json