Thanks for creating a Linux version!
I'm getting very confused, though: The site shows an Ubuntu logo instead of a Linux logo. Is The Real Texas packaged in a way that makes it run only on Ubuntu instead of Linux in general?
The technical requirements say: "For Linux, you will need NVIDIA graphics (they are the only vendor with OpenGL drivers.)", but that's not right, all vendors ship OpenGL drivers and there are FOSS OpenGL drivers for most cards as well. Intel's drivers are all FOSS, Intel participates directly in Linux kernel development and Xorg development. For the other two, AMD offers a horrible proprietary driver and Nvidia offers a decent proprietary one. Most older AMD cards also work with FOSS 3D drivers (the 'radeon' driver) and many older Nvidia cards work with FOSS 3D drivers (the 'nouveau' driver).
So I'm puzzled by the requirements, otherwise I'd buy
I have an onboard Intel card in the i7 CPU, it runs even heavier games like Xonotic reasonably well with Intel's own FOSS drivers that come ready-packaged in Debian GNU/Linux. I don't see why the card should have trouble running The Real Texas.