I too am having issues very similarly:
[2024.05.23-06.11.36:534][ 0]LogInit: Initializing SDL. [2024.05.23-06.11.36:539][ 0]LogInit: Warning: Could not initialize SDL: No available video device [2024.05.23-06.11.36:539][ 0]LogInit: Warning: FLinuxSplashState::InitSplashResources() : InitSDL() failed, there will be no splash. [2024.05.23-06.11.36:539][ 0]LogInit: Initializing SDL. [2024.05.23-06.11.36:543][ 0]LogInit: Warning: Could not initialize SDL: No available video device [2024.05.23-06.11.36:543][ 0]LogInit: Error: FLinuxApplication::CreateLinuxApplication() : InitSDL() failed, cannot create application instance.
with and without said env var…