So basically since Proton 10 I believe, and with the addition of NTSync, all COD games from the golden era are perfectly playable.
How I install Plutonium on my system (very beginner-friendly):
-Download BO2 on Steam (idk if you have to, but I like to boot the vanilla game once through Steam).
-Download Plutonium.exe.
-Install Heroic Games Launcher. (Install it in whatever way you prefer; I usually use the "yay" command.)
-Go to library and press on the big blue button that says "ADD GAME."
-Add the Plutonium.exe under "Select Executable">Select Platform Windows>Wine version, picking the newest Proton or the GE version.
-Press finish.
Have fun.
It's not the most ideal way I would say to play the game, but if you are not that into Linux, Heroic will be a big help in many ways. Especially for laptop users struggling with games detecting the dedicated GPU.
