My default Ubuntu is 14.04 which also does not work.
Atleast some of the issues seem to be specific to whatever Java is used, and mostly specific to trying to install the assorted updates and packages needed for MQX.
I can understand that Freescale might not have the resources to support every flavor Linux out there.
Mint, Ubuntu, and Debian are not only the top 3 distro's but very close to interchangeable.
Centos is currently the 7th ranked Linux Distro.
Regardless, of what you chose to support atleast limited testing accross multiple environments helps to improve the quality of your product.
Just as building an OS or application for multiple processors and architectures often exposes bugs and improves code quality.
I cross compile the embedded K70 application I work on, for Windows and Linux as well as MQX.
It helps weed out problems that are obvious in one context but hard to find in others.