ONI not generating a Player.log file (running on Linux via Steam using Wine/Proton)

Obviously, on Proton the log file needs to be looked at
/home/<user>/.steam/steam/steamapps/compatdata/457140/pfx/drive_c/users/steamuser/AppData/LocalLow/Klei/Oxygen Not Included

but what didn't suit you about the Linux native version ?

1. ONI runs natively on Linux, and by default, Steam will use this native version unless you go out of your way and manually select a version of Proton as a compatibility tool in the game's properties:
   
   (Conversely, games that default to using Proton even though they have a native linux version - points finger at Don't Starve Together - can be forced to using the latter by selecting one of the "Linux runtime" options. Those don't appear at all for games that don't have linux builds available.)
2. As far as a user of Steam is concerned, Steam doesn't care what OS you purchased a game on - if you own ONI on Steam, you have access to all (Windows/mac/Linux) builds. You can install different builds across different devices. You owning the game on Steam always covers all builds.

Where was the log file you attached? The content indicates it's from a native linux version, and is dated March 18th this year, not February. 

Check the game's properties in steam - which directory is used depends on if you're running the native build or the windows one through proton.

If you are running the Linux version and the log still doesn't appear, then it might be some kind of permission/access issue. I haven't encountered any myself, maybe you're running the dreaded Flatpak version of Steam..? You can check if that is installed by issuing this in a terminal

flatpak list | grep -i steam

 

8 hours ago, Sanchozz said:

Obviously, on Proton the log file needs to be looked at
/home/<user>/.steam/steam/steamapps/compatdata/457140/pfx/drive_c/users/steamuser/AppData/LocalLow/Klei/Oxygen Not Included

but what didn't suit you about the Linux native version ?

Thank you for your comment. Honestly, I didn't choose one or the other. I think Steam was actually already installed using Nobara Linux and then I downloaded ONI after logging into my Steam account. I'm pretty new to Linux so I was glad to see it "just worked" (as they say).

8 hours ago, myxal said:

1. ONI runs natively on Linux, and by default, Steam will use this native version unless you go out of your way and manually select a version of Proton as a compatibility tool in the game's properties:
   
   (Conversely, games that default to using Proton even though they have a native linux version - points finger at Don't Starve Together - can be forced to using the latter by selecting one of the "Linux runtime" options. Those don't appear at all for games that don't have linux builds available.)
2. As far as a user of Steam is concerned, Steam doesn't care what OS you purchased a game on - if you own ONI on Steam, you have access to all (Windows/mac/Linux) builds. You can install different builds across different devices. You owning the game on Steam always covers all builds.

Where was the log file you attached? The content indicates it's from a native linux version, and is dated March 18th this year, not February. 

Check the game's properties in steam - which directory is used depends on if you're running the native build or the windows one through proton.

If you are running the Linux version and the log still doesn't appear, then it might be some kind of permission/access issue. I haven't encountered any myself, maybe you're running the dreaded Flatpak version of Steam..? You can check if that is installed by issuing this in a terminal

flatpak list | grep -i steam

 

Thank you - excellent reply and very helpful. A couple points in response:

- The Compatibility thing, I'm using `Proton-GE Latest' which is actually from the guy who created Nobara and it works very well for several other games I run. Would that be something that could cause the logs to save in diferent places? As in I'm actually not running the Linux version so it's not saving in the Unity3D folder (where Linux is supposed to save)?

- The log file attached was the only other "log file" that I've got in that Unity3d folder. The other Proton location (under /.steam/...) doesn't have any logs.

- So the March 18th the date of the "Player-prev.log" provided is the create date which I also saw in the deleted "Player.log", but I also saw initialization dates in that one going back to February, which is why I mentioned it. (I may be confused on this point, because I think March 18th was also the last "Player.log" that I had). Again, I deleted that log file thinking that it would be recreated by ONI, which it wasn't.

...

So, quick Discord chat with the Nobara Linux people and this distro automatically installs Steam via DNF and maintains it through that repository. There IS a Flatpak version, but `flatpak list` doesn't show anything related to Steam and I've confirmed that's not the default way to install Steam on Nobara.

Another piece to this puzzle, I've found that the latest version of Proton-GE was released on 3/18/26 so that being the last log I had, is it possible that running the game through the latest version of Proton isn't saving the log file(s) properly?

If it is an issue with Compatibility and/or Proton - what is the troubleshooting path? Do I try running it without Compatibility for Proton-GE? Re-install Steam?

Or perhaps there's some as-yet-unknown location where log files could be written?

 

 

Eureka! I think I may have found this 3rd location for log files on Linux running OxygenNotIncluded through Wine/Proton for games made with Unity:

/home/<user>/.steam/steam/steamapps/compatdata/457140/pfx/drive_c/users/steamuser/AppData/LocalLow/Klei/Oxygen Not Included/

According to a single comment from 5 years ago (3rd page in Discord searching "Player.log") someone referenced this format:

Inside the [Wine] prefix using 'c:\users\steamuser\AppData\LocalLow\CompanyName\ProductName\Player.log'

So there is in fact a `Player.log` in that folder and it's from 4/19/26.

Hopefully Google picks up this thread so other Wine/Proton users can find this secret cache of Unity gamedata logging under these somewhat specific conditions.

Good luck future people!