Now it works. AWESOME!
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I ran "sudo apt install libsdl2-*" and the sounds files are all in DL/bin/assets/sounds/. (a bunch of .ogg files)
If you're not able to reproduce the issue, then I guess I won't be able to fix it. It's unfortunate.
T ^ T <(Thanks for trying though.)
From what I've gathered, it means that it was compiled with GLIBC version 2.28 and your system uses an older version.
For me it's too complicated to install an up to date glibc version, because it also has dependencies.
The battle music is also a bit short as well. We also had a lot more SFX which we wanted to add, but considering the fact that we submitted our game like 1 minute before the deadline I'd say we can live with that. ;D