tried to run it and..
./Funkin: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by ./Funkin)
./Funkin: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by ./Funkin)
Your Linux distro has an outdated GLibC, sadly it can't just be upgraded without changing distros or breaking your system.
You can try my build which works for older GLibC versions (2.29 and later).
Or you can try running the Windows version in Wine.
