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Phaedrus567: Having a similar problem.

On my system (Debian Jessie, 3.16.0-4, 64-bit, fglrx drivers), the loading screen will show (King/Queen on a horse) and when it finishes loading and goes black for the "next" screen... it aborts to the terminal again.

I tried running the game in a Virtual Box of Debian Jessie i386 to see if it was a multi-arch issue. But in that case it instantly crashes without even trying the loading screen.

I realize that Debian isn't officially supported, but maybe a wise Linux user has some ideas to try.
We've pushed out an updated Linux version of the game today. Culd you check and see if the updated version works better for you? Also, are you willing to try the game with the official drivers instead of the open source ones?
Bluubekt: Just bought this game and I have the same problem as @etherdrifter and @weetabixh:

me@machine:~/Games/Kingdom New Lands$ ./
Running Kingdom: New Lands
Set current directory to /home/me/Games/Kingdom New Lands/game
Found path: /home/me/Games/Kingdom New Lands/game/Kingdom.x86_64
Mono path[0] = '/home/me/Games/Kingdom New Lands/game/Kingdom_Data/Managed'
Mono path[1] = '/home/me/Games/Kingdom New Lands/game/Kingdom_Data/Mono'
Mono config path = '/home/me/Games/Kingdom New Lands/game/Kingdom_Data/Mono/etc'
displaymanager : xrandr version warning. 1.5
displaymanager : trying .X11-unix
client :0 has 1 screens
displaymanager screen (0): 1280 x 800
Using libudev for joystick management

Importing game controller configs
me@machine:~/Games/Kingdom New Lands$

The screen flickers briefly and then I'm dumped at the prompt. This is on a laptop with an integrated Intel GPU, running Xubuntu 16.04. I suspect the root cause is that the version of Unity used by Kingdom: New Lands requires a GPU with OpenGL 3.2 support, while the Ironlake GPU I have (or at least the Linux drivers for it) only supports OpenGL 2.1. Shame, seemed like a nice game, and certainly didn't look like it would require very modern hardware. Perhaps someone should update the System Requirements listing?
Could you check if version 1.2.8 still crashes for you? We just updated the game to version 1.2.8 today.