UE5 Headless Dedicated server crashing on startup Linux

Development Platform & Builds
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1

Hi there,
We recently moved project from ue4 to ue5

after updating our build scripts and project
we made a linux dedicated server build.

but it always crashes on startup with :

error: XDG_RUNTIME_DIR not set in the environment.
LogInit: Warning: Could not initialize SDL: No available video device
LogLinux: Warning: MessageBox: Plugin 'OpenXR' failed to load because module 'OpenXRHMD' could not be found.  Please ensure the plugin is properly installed, otherwise consider disabling the plugin for this project.: Message: No available video device:

UE4 server worked fine without any issues.

UE5 throws the error above,
Ive tried to manually re-build the plugin.
ive tried to disable it. (plugin still tries to load, and no we dont use it, nor is it enabled in project)
tried disabling anything VR related i could find

and anything else i could find on google with no luck so far.
at this point I’m not even sure if the crash is related to this “OpenXR” plugin at all

PS: we used to get the :
“LogInit: Warning: Could not initialize SDL: No available video device”
message in ue4 builds as well ,but everything worked fine.

and by now im out of ideas.
Any help would be appreciated.

2

wouldnt say we got it fixed more of a workaround,
We got around it by physically removing the OpenXR plugin from engine prior to making a build. That did stop the plugin from being included and the crash from happening.

3

@Sarr
It could be another plugin, that OpenXR utilizes, that you also need to enable. I think its the OpenXRHMD. Other than that, everything else I’ve found online for this error is related to the server.
I hope this can help!
-Zen

4

@Sarr
To remove reference to the plugin (even if it’s not active). Close your project, then open up the .uproject file in a text editor. Remove the JSON code that references against the OpenXR entry from the file. It’ll probably look like this…

{
			"Name": "OpenXR",
			"Enabled": true,
			"SupportedTargetPlatforms": [
				"Win64",
				"Linux",
				"Android",
				"HoloLens"
			]
		} ,

Make sure the JSON delimiter syntax is correct between plugin entries. Save the .uproject file.
Then restart the project.

5

as i stated in the initial post, the plugin isnt enabled, it was not even mentioned in the uproject file.

also we building the server on a headless, as in no graphical user interface

@ZenLeviathan tried that too, didnt help.

we also tried to adding the json code bit to the project and setting “Enabled” : false and it still tried to load the OpenXR plugin, untill we physically deleted it from the engine.