Hi! I’ve seen there are beta builds of Unity for windows and mac (Upgraded Mono/.Net in Editor on 5.5.0b4 - Unity Engine - Unity Discussions) where you can change the API Compatibility level to .NET 4.6. Is such a build available for Linux? I’ve downloaded the latest linux release (5.6xf1) and the only possible choice is .NET 2.0 subset. I’d love to test it out not relying on my WIN10 VM 
Sorry, these builds aren’t available for Linux yet.