as the title says, can you change scaling modes to so called 'full panel' or 'maintain aspect ratio' in linux ubuntu, like in windows?
I cannot answer your exact question, but I do know that the gaming environment in Linux derivatives is generally much inferior to that found in Windows, imo, from the driver environments to API support to developer support. Many so-called "Linux" games require emulators to run--that is, you get the Windows version but have to run it through an emulator in order to play the game under a Linux derivative. If you are someone with more than a merely casual interest in games but you you need Linux for specific reasons, I'd advise you go dual-boot Win10/Linux--that way you won't miss out on your gaming.
True, many games do need a so called emulator. But not cs go, it is native to linux as of now. Is there really no way of having a stretched resolution or with black bars?