To whom it may concern:
The game install and Audio IS broken under linux due to path incompatibilities on NTFS to EXT4.
To fix it, do the following:
1: Install the mod to ~/.local/Share/Steam/steamapps/sourcemods/Portal-stillalive
and NOT [...]/sourcemods/Portal-StillAlive
Notice the capital letters in Portal-StillAlive
2: Reinstall the base version of Portal under Proton instead of native or runtime (I used Proton 6, but I would assume most versions work)
This should fix the issues
Azkoh
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