'"Shader Unsupported" when starting Unity server with -batchmode -nographics flags

I am trying to make a Unity game with their new MLAPI (Mid-level networking API). I've followed this tutorial exactly without changing anything, and the game is running fine on my local (Linux) PC.

You can see there how a server instance and a client instance communicate, but both use a GUI windows, and I want to later-on run the MLAPI server on a Linux server with no GUI (headless).

I tried 2 methods (both on my local PC and my cloud server, with the same results) which both lead to the same error message:

  1. Run 
    ./testbuild.x86_64 -batchmode -nographics
  2. Check "Server Build" in the "Build Settings" menu and run 
    ./testbuild_server.x86_64

Initialize engine version: 2021.1.6f1 (d6fd741ee4c5)
[Subsystems] Discovering subsystems at path /home/jan/Dropbox/py/unity/ofun/janbuild/testbuild_server_Data/UnitySubsystems
Forcing GfxDevice: Null
NullGfxDevice:
    Version:  NULL 1.0 [1.0]
    Renderer: Null Device
    Vendor:   Unity Technologies
Begin MonoManager ReloadAssembly
- Completed reload, in  0.083 seconds
ERROR: Shader Sprites/Default shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
ERROR: Shader Sprites/Mask shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
ERROR: Shader Legacy Shaders/VertexLit shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
WARNING: Shader Unsupported: 'Standard' - All subshaders removed
WARNING: Shader Did you use #pragma only_renderers and omit this platform?
WARNING: Shader If subshaders removal was intentional, you may have forgotten turning Fallback off?
ERROR: Shader Standard shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
WARNING: Shader Unsupported: 'Standard' - All subshaders removed
WARNING: Shader Did you use #pragma only_renderers and omit this platform?
WARNING: Shader If subshaders removal was intentional, you may have forgotten turning Fallback off?
ERROR: Shader GUI/Text Shader shader is not supported on this GPU (none of subshaders/fallbacks are suitable)
UnloadTime: 0.684933 ms
ERROR: Shader UI/Default shader is not supported on this GPU (none of subshaders/fallbacks are suitable)

I've seen some other people online use NullGfxDevice with success, so is this just an issue with Linux builds?

I tried adding the mentioned shaders in Project Settings > Always Included Shaders, but that just led to build errors, plus UI/Default was already included there.

Is there a way to prevent these errors or will I just have to rent a server with a GPU?

c++sharpunity3d


Solution 1:[1]

Ok. I wasn't able to get it to run in nographics/batch mode, but the code does run with ./testbuild.x86_64 (no flags) on the server, and I am able to connect to it from my local PC. So I can apparently just ignore the error message.

But it does run at 100% CPU, which makes me suspect it's emulating graphics on the CPU at great cost. See my other question.

Sources

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Source: Stack Overflow

Solution Source
Solution 1

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