Steam has Steam Play which automatically applies Proton (modified version of WINE) and/or DXVK to titles when enabled. You have ProtonDB (similar to AppDB for WINE) which discusses about the compatibility of the game. You could always manaully configure WINE yourself or use Lutris (as it is a graphical front end for automating the process of setting up WINE) for GOG titles that aren't natively available on Linux. There is also a plethora and growing number of games being released on Linux among each storefronts.

Interesting... I've followed the steps creating a deb package; when it goes to installing the game, now it's complaining about lack of libglu1-mesa and libxcursorl libraries (same as before), which makes me think I'll hit the same dead end when some dependency can't be downloaded and why i stopped trying a few days ago.

So ran apt-get install -f, for the missing dependencies, tried running and just outputs the same problem i had before, setting a path and then crashing with a core dump...

I have about ~ 8000 games on Steam and when I install the Steam client on Linux and don't enable Proton, I have about 35% listed. (this is ~ 2800 NATIVE games). If I enable Proton this rises to about 40-45% of my games working on Linux out of the box with some clicks.

So this is "no" games?

The fabled Linux Galaxy client is another thing GOG will not do, because it does not fit in its business plan.

Perhaps I should do some sort of mini-website called "Reasonable things the community strongly suggested, but the community-friendly GOG will not ever implement, because it does not fit their business strategy, fear this will undermine their sales or is not included in the latestet hipster web design layout trends. Special section with broken promises included."

I think the main reason why GOG has not done a Linux variant of the (new) Galaxy client is that it has some blatant hard-coded Windows dependencies in its guts.

The other Electron app part (user interface, Python plugin structure) should not really be such a problem.

If GOG is such copycatting the Steam client, perhaps they should install Steam on an Ubuntu VM and go explore $HOME/.steam ?

The Illegal number: apt error you get should not happen, so something seems to be wrong even before installing the packages.

I invite you to copy this issue in the dedicated thread I linked, it will be easier to help you if this is not mixed in another discussion ;)

Linux gamer since 1999. GOG has what I want exactly DRM-FREE binaries linux native games. I just recently got in the Steam in late 2019 and I'm still not OK with using clients to get my games. I do like Lutris and itch.io because it's a client where I dictate what it can and can not do and I can run the games outside of the client without issue. But I'm an older gamer that still gets boxed games where I can.

Dot com

Well, thanks for the comments guys, I'm glad the debate got some traction.

I want to add some clarifications.

First, funny how triggered someones were with the GNU/Linux use, jajaja, well, I'm and old timer huge GNU fan so it sticks with me...

Second, I'm glad GOG exist and was a big fan but to me GNU/Linux support if THE most important issue when I get soft or hard, I know GNU/Linux market is not huge but that's because the support is limited, and that's because the Redmond lobby thought the ages. I believe it can change, but as always, we the consumers must demand it. If we dont care, they dont care.

Third, I really "feel" Steam support is better, not only for the native client working exactly the same in any platform, but also for all the work Steam itself is putting in to make their library compatible. If you follow some of the GNU/Linux gaming forums/news you can, like every day, find some news about Valve and some contribution to the kernel, the drivers, the wine code, some of their own devs working here and there to that goal.

Their close work with Code weavers to get Proton improve also help Wine, with in the side benefits all the GNU/Linux community. You don't want Steam, fine, you can use Wine or Lutris (with Wine) to use GOG games on GNU/Linux. That gaming improvement, in a small portion, is push by Valve's involve in get their library compatible.

https://www.codeweavers.com/about/blogs/aeikum/2019/8/20/a-year-since-protons-launch
https://www.gamingonlinux.com/articles/codeweavers-on-how-proton-steam-play-helped-improve-wine-42.13845

I'm not even asking GOG to make such and effort. I only asked for a native Galaxy client. They don't even care about that. That's why I'm disappointed with the platform. I still think they are great with their DRM free policy and their games, (CDPR games) are gold, so I will still buy those games (in Steam), but the platform, GOG, not.

But that's me. Thanks for all the comments and the good vibe. I really like this community.