I loaded the Windows version of the drivers and the Arduino IDE an got a lot farther:
- yes there is another UART ( guessing that there are actually 3), my cables are good, so I'm guessing that my USB tables need updating. This part can be confusing because both show up as choices under the Ports menu item, but only one will work
- the LED marked DS2 near the battery connector is attached to Pin 13
- there is an LED marked DS1 that appears to be for power and another marked DS3 that blinks when jumper J13 is opened
- Under Windows, my sketch compiles and runs.
So it looks like there is more work needed to get the packages to run under Linux, especially Ubuntu 14.10