That page is referring to the native Linux binaries that Unity can export (which work great and has been available for a while). It's also quite stable so not s

That page is referring to the native Linux binaries that Unity can export (which work great and has been available for a while). It's also quite stable so not sure why they're still calling it a preview. The parent post is referring to the Unity web plugin for Linux which AFAIK does not exist at all (only Windows and Mac support for the browser plugin).