Have you checked their Installation guide? http://www.emutexlabs.com/ubilinux/29-ubilinux/205-ubilinux-installation-instructions.
They suggest three options to connect to the Serial port; the third one refers to the Galileo Gen 1 board, so you can ignore that option:
- For the first option (the one you’re trying to implement) you’ll need the drivers, “requires additional Driver on Windows; please refer to the Arduino IDE Setup for Galileo”.
- The second option makes use of a TTL 232R 3V3 serial adapter (you can look at the link above for more informational links).
Regarding the first method, I’m not sure if by “Arduino IDE Setup for Galileo” they refer to the Galileo Getting Started Guide. I suggest you to ask in the Emutex website. In any case, here’s the link for the getting started guide https://software.intel.com/en-us/iot/library/galileo-getting-started. In the meantime you can try with the second method.
I have checked the installation guide, i cant find any usb-driver that works with the ubilinux-image, i've tried with the drivers in different Arduino releases back to Arduino 1.5.3, (1.6.5 is the current now), none of them seem to work.
In that case I think the best would be to contact Emutex support and wait for their response. We support the Yocto image, so I think the Emutex crew can give you a more accurate answer regarding their custom image.