You've hit your 1 Linux device limit but nothing shows

Software Intel®-based platforms
1

I've tried to add a RPi recently and had trouble loging in with google using ssh, that's an altogether different post, now I tried to remove that RPi instance but nothing shows and I can't add one either as I get the pop-up: You've hit your 1 Linux device limit.

How can I solve this?

2

I think you're encountering the same bug as reported here:
https://forum.arduino.cc/index.php?topic=626992

I've reported the issue to the Arduino development team.