[2020] Linux singleplayer?

We don't support linux servers. (Not because we don't want, but because there is no easy way to do so and resources are too limited to go the hard way for an unfortunately rather small player base) As the game runs on a server in singleplayer we have no way to offer that to linux players. If you run the server manually with mono, you can play on your computer. But keep in mind, that using mono is likely to cause a lot of issues and has a bad performance.

We actually have converted the server to .NET Core, so singleplayer support for Linux will likely be available soon, maybe even for 9.0. Still, linux gaming is a very little market, with less than 1% of our current population, with not much more to expect even with singleplayer available (i would be surprised if it would be different), so, no, it's not really limiting our player base, in all honesty. The game design is more limiting.

Being a long-time linux user myself i do understand your feelings, but some parts of the linux community don't seem to understand that they're a major minority and behave inadequate in regards to what the linux communities values actually are. (Freaking out at devs, including insulting, presenting them as a majority they aren't, being rude - everything seen already, unfortunately)

TL;DR: Singleplayer for Linux likely is available soon. The game ever already was available for Linux and Singleplayer is not what Eco is made for. And yes, that means servers can be hosted on linux servers natively in the future and performance on windows servers is also noticably increased.

Well, even that is not true, as actually most server hosting companies use windows servers nowadays, just for the reason of most games not having linux dedicated servers anymore. All the games that have no dedicated servers available for download but only for hosting do run on Windows.

Linux is supported for dedicated servers as of 9.0, but singleplayer follows in a later patch.