I have absolutely no clue how to fix your issue, honestly. You are the first linux user (in at least 5 years of doing this) that has ever reported anything. I tested the game in my linux VM and it works fine there. The only other thing I can suggest is maybe redownload it fresh. Did you by any chance copy the latest download OVER the previous game folder from the last version? If you did, that will cause strange issues on any device.
No, I never do that when updating a game. I just delete the entire folder and files and download the new one. However, in the case of Serenity, I just started playing your game like 2-3 days ago, so I never updated anything. It's a fresh install from scratch.
I did log onto Windows and the game runs just fine. It seems to be a Wine issue. What I'll do is go back to Windows, make a save for after the crash point, then back to Linux and load that save to see what happens.
Edit: Made a save and loaded it on Linux. Works fine. Rolled back the game and then went forward again. It got past the crash point with zero issue. Then I loaded the previous save I used and it crashed again. No idea what the issue is, but I can get past it now, so idrc. Thanks for the help though :)
On linux: ~/.renpy/game_directory
You can also look in the game folder itself under: game/saves
With that said, for you it could be different. Doubtful, but I just find it really odd that when you sent me that traceback, it showed Windows at the bottom. When I get a traceback in my linux vm, it shows my linux build at the bottom. It could just be the way you have your system setup and may have nothing to do with anything. I've just never seen that happen before. Glad you got it figured out :)