batchmode and nographics

The official online document explains the -nographics(Windows only) as below:

"When running in batch mode, do not initialize graphics device at all. This makes it possible to run your automated workflows on machines that don't even have a GPU."

I want to make a game server running on linux, and use the argument "-batchmode" to make it run in headless mode. But "-nographics" could not be used on linux. Will the unity game server needs GPU support? It seems that "-batchmode" disables the rendering(Does it means no GPU support is OK?)....I am quite confused?!