For anyone else looking to install FOP2 on their Cubox-iPro, I recently had the time to figure out what was happening, and to get FOP2 to work as hoped.
Originally, I was following the "installation" instructions on the FOP2 web site, where you are presented with 4 choices to download the appropriate package for your system, using the WGET method. The packages are for Centos and Debian, each with 32 and 64 bit versions. Since the Cubox runs Ubuntu (Debian), it seemed logical to follow this route. Neither the 32 bit, nor 64 bit version worked. So, I set this project aside for a later time.
A week later, I visited the "download" page of the FOP2 web site, and noticed there is another package available for Arm processors, which the Cubox has. It is an older version of software, 2.27 versus today's 2.29, for the standard packages, but I downloaded the Arm version, and ta-da... it now works as expected!
Hopefully this will save someone else the grief...