Hello @crowmagnumb, Proton uses DXVK to translate DirectX 9/10/11 to Vulkan and your system is missing Vulkan drivers for your Intel chipset. Please run sudo apt install mesa-vulkan-drivers mesa-vulkan-drivers:i386 and retest.
Also, the nvidia 390 driver which is installed on your system may cause additional complications due to that driver being older than the support cutoff for Proton. (If it doesn't cause trouble, then this comment is irrelevant.)
Thank you! That did it! My nvidia driver seems to be OK. Cheers!
proton 5.0x1 2020-09
Compatibility Report
System Information
I confirm:
steam-1052990.log
Symptoms
I run the app from Steam (using Proton 5.0) and it thinks for a moment and then just stops silently. No output, no window ever opens. Attached is the log file that is generated by the session.
Reproduction