Yes, it is possible only for Android (ios still needs a mac).
You can develop for it using Xamarin.Android on Linux. Here's the guide:
Note that MonoDevelop won't build the game for you, so I advise you to only write code on it and then build it on terminal following the guide I mentioned above (there's no need for Rider IDE). I followed the steps and did it successfully. I'm a Lubuntu user btw