I just wanted to start using the Arduino dock. After all setup went well including that the ArduinoIDE detected the available Omega Network connection, it constantly fails to compile any sketch with
"The current selected board needs the core 'arduino:arduino' that is not installed."
Google searches did not help even though it looks as if the Omega Board Library is not working.
ArduinoIDE Version is 1.8.9
Having installed the same on Windows is working without error.