Best C# IDE/Compiler for Linux?

Mono appears to be dead. I enjoy making life hard so I dont use windows. I am trying to learn very simple c# but am having trouble gettung visual studio to run anything on linux (debian/mint). It wont even run with dotnet in the terminal either. I dont really like all the features in vs either, i just want simple.

For reference im learning with the yellow book by rob miles. I want to learn the old way, not using a bunch of shiny helping tools (i never feel i really learn with those and it stunts my growth).