The new library view has a filter by system. One of the choices is to filter by either Mint OR Ubuntu. Mint literally is built off Ubuntu, and by extension they are both Debian.

Since this filtering system was intentionally designed and setup this way by GOG, I am no intrigued:

Which game(s) EXACTLY that are in GOG's catalog filter to/only run on Ubuntu OR Mint, and not both?

Certainly none of the games I own, they show up under both filters (as makes logical sense to me).

In brief, this appears to be a redundancy, only the base "Linux" filter that already exists seems to be needed and relevent.

Convoy is an example of a game where the developers only officially support Ubuntu.

http://www.gog.com/forum/general/the_what_did_just_update_thread/post9069

Thanks for finding the only 2 examples from that other thread.I suspect they work on Mint anyway though, for reason I posted above.

I think game devs focus on Ubuntu because it's the big name for Linux on the desktop and Mint may be "just another spinoff" to them. Being backed by a resourceful company is another plus for the Ubuntu name.

Devs can write whatever they want in the system requirements page, the user should take that just as a reference not an absolute. For the record I'm currently using Mint as my main OS and I've had close to 0 issues with games, even better I don't have many of the issues Ubuntu users report.

Edit: I should point out that most game sys reqs on Steam mention only Steam OS / Ubuntu xx.xx

Linux has always taken a back seat when it comes to support. The good thing is that community support is generally more informed and knowledgeable than many MS certified professionals. I applaud the GOG. It validates a growing trend to move from Windows to Linux. I think a lot of developers are making the move. As far as Ubuntu/Mint- Both are the most popular Linux distros. You certainly wouldn't see support for a distribution on the bottom of the list at Distrowatch. It only makes sense.

I wouldn't use Distrowatch as any measure of user base however. See their disclaimer:
http://distrowatch.com/dwres.php?resource=popularity

To all Legend of Grimrock Linux players with GTX 900 cards:

As you are probably aware of, the game stopped working with newer Nvidia drivers on 900 series cards. I've created a workaround that will make it run on such drivers.

Download Link: Grimrock_GTX900_Fix_(tested_up_to_349_16).tar.gz

Installation: Extract the archive in your "Legend of Grimrock/game" folder (merge if asked).

This has been tested up to driver version 349.16, can't guarantee it will work for future version (I'm hoping it will). Hopefully an official patch will be made to fix this.

What exactly did you do?

Interesting. My shading language is reported as 4.50 for 349.16 driver (GTX 680). Can it be Nvidia's issue, or it's something with the game? It's worth reporting it to Nvidia too (they have a script for assembling bug reports).

At first I ran the game using the 343.36 drivers normally and it worked fine.

But what I can't confirm is whether it's coming from the game or from the driver. I don't know much about shaders and programming but could it be the game is trying to use a newer shader and causing it to crash?

When I saw the first signs of life after mixing in the older libraries it seemed as if the game is now using the correct GL version.

I forwarded this info to the dev and the person who ported the game as well and posted the fix on gamingonlinux and steam to gather some feedback if it's working for others or not. I'll wait a bit for any responses and will send a report to Nvidia.

What release of Ubuntu 14.04 do you use (14.04, 14.04.1, 14.04.2) this can make a world of difference being each point release effectively has different X and Kernel.

Also please bring the Witcher 1 to Linux (even if it is a Wine/eON wrapped App.

Many people seem to forget, or possibly truly aren't aware, Linux is, and only is, the kernel. The differences in the distros comes down to default software, package management, and possible custom tweaks / patches. As for the distro fragmentation and possible support issues, any program designed to run on Linux will run on any distro, provided the necessary libraries are installed. Where this becomes a problem, is with different versions of said libraries, and / or knowing what package to install to have access to said libraries. Beyond that, Linux fragmentation is a myth. Don't take my word for it. Google icculus (Ryan C Gordon, responsible for numerous Linux ports over the years) and see his statements on the subject (I believe the relevant topic was at Steam Dev Days '14).

https://icculus.org/SteamDevDays/SteamDevDays2014-LinuxPorting.pdf

Just a reminder. Did you back inXile's the Bard's Tale IV? If not - go and check their campaign:
https://www.kickstarter.com/projects/inxile/the-bards-tale-iv