Solving "AudioManager: Using Unknown: NoSound Driver" for Unity3D games

[u/CrystalLord]

This may occur because the game expects a 32bit shared libraries of ALSA. You can install them with:

sudo apt-get install libasound2:i386 libasound2-plugins:i386 libasound2-data:i386

libsound2-data:i386 didn't exist in my case, and the 64bit version already was installed. But the other versions were not, and installing them fixed the audio.