Mono and entity framework, which database to use?

I was looking into monoproject website, and I saw they have entity framework support. Source: http://ift.tt/1ti6Jao

But my question is: Is it supposed to be used within Postgresql database, since Linux does not support sql-server. Or this is a bad idea, and I should stick with sqlite.

If you think sqlite will provide an easier database engine(the project is very small), please can you suggest a good nuget = ]