The Linux build of Payday 2 is absolute garbage. Tons of missions are impossible to complete because of Overkill's lazy porting. Most mods are made for Windows and might not work on Linux. Additionally animation replacement mods are not compatible with this version - they will crash your game as soon as the animation tries to play.

Here are some screenshots showing how broken the Linux port is:

Thanks Overkill

Go to the Steam settings

Go to the Steam Play tab and enable Steam Play for supported and other titles. You will have to restart your Steam after applying changes.

After restarting your Steam right click on Payday 2 in your library and select properties

Go to the General tab and enable force use of a Steam Play compatibility tool and select Proton 4.11 or latter

Now Steam will have to re-download the game because the assets files are not the same on both of these platforms

Go to https://superblt.znix.xyz/ and download SuperBLT for Windows
Skip this part if you are using any other Lua Injector instead.
Extract the downloaded archive and place it anywhere you'd like.

Open your Payday 2 installation folder. To do that open your Steam, right click Payday 2 in your library, go to properties, local files and browse local files.
Copy the WSOCK32.dll (or IPHLPAPI.dll if you are using something else) file you've downloaded earlier to the Payday 2 folder.
Because Wine/Proton doesn't use DLLs in the same way as Windows does you have to change some stuff.

After that you have to go up to the steamapps directory, then compatdata, 218620, and pfx.
Open user.reg with editor of your choice (I'm using gedit) and search for Software\\Wine\\DllOverrides, if you don't find anything, try Software\\\\Wine\\\\DllOverrides.
In the next line paste "wsock32"="native,builtin"
You're done! Launch your game and download the BLT base mod.

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If you like free software and/or Linux gaming conciser staring these repositories on GitHub:
ValveSoftware/Proton [github.com]
wine-mirror/wine[github.com]
doitsujin/dxvk[github.com]
Joshua-Ashton/d9vk[github.com]