OK, I understand that you can not test it ... just a pity. My AMD system is quite new and fast - but under Linux it is really no problem ... have a lot of games ... and also 32 bit one.
I understand - it's the game engine version forcing 32 bit ... but as said this is not the problem in 1st instance. But maybe with a new game engine it may be easier to get it run on modern systems ...
Segmentation Fault can happen if trying to use libraries no longer compatible to linked libraries provided by the distribution. But as I tested also Bionic (the oldest one supported - Xenial is only in rare cases supported on the desktop - and to old to run on my new system) I can not understand it ...
Would have liked to see your game ... but thanks for your reply!