In my blog 'Debugging Through the .NET Core framework' I give specific instructions for setting Visual Studio up so that you can debug into the source code for the .NET Core Runtime. Since Version 2.1 of the .NET Core runtime, it is also possible to do this using the 'Visual Studio Code' editor. Since Visual Studio code runs on Linux (as well as windows, or MacOS), this is what you would be using if you were developing on non-windows platform.