I am unable to find any solution to this Unity error anywhere on the internet and it seems that I shamefully must be the first to ask and in such a bad form at that. My code is unlikely to be at fault – it would state so in the error. I do not know, how to replicate it, nor what causes it as I have not done anything with the settings so far, but it is there in the console always staring me down – it does not prevent the game from running or building though. It is therefore likely a result of an failure in my installation of Unity. I am currently on a bit of a tight schedule and would not want to have to reinstall Unity for this, if I don’t have to.

Error in question:
Unrecognized thread niceness after calling setpriority. Target niceness is -6 and actual niceness is 6 UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

So far I just tried to search for a question with a similar problem. I do not know, where else to begin on this.