You should check proton logs. Add the following to launch options: 'PROTON_LOG=1 %command%'. Then launch the game, you should see log file appear in your home directory.

Also, what's your graphics card?

Their core business is hosting linux for other people at this point.

https://wiki.winehq.org/FAQ#Is_Wine_malware-compatible.3F

There's also RetroArch, though can be a little pain to setup.

Vast majority of games work just fine on linux, can't say for launchbox (looks like just a game launcher, if so, you can use Steam Big Picture mode, even for non-steam games, emulators etc.)

Visual Studio does not work, but if you're a C# developer, there are cross-platform alternatives like VSCode and Rider.

Note: probably don't use Ubuntu if you're trying to escape a corproation dictacting how to use your computer though

You clearly haven't used wireless headphones in last 10 years, have you?

"not my religion!"