Why Ubuntu 14.04 LTS
It’s all in the LTS – Long Term Support provided by the Ubuntu folks.
14.04 LTS is supported until 2019.
The LTS helps us support CounterSnipe Software in a steady and stable way.
The LTS enables us to offer support and maintenance contracts for 3 years
The 16.04 version will be available in 2017 but other than some hardware drivers we do not expect much change in IDS/IPS performance resulting from this change.
We do not use any features of Ubuntu itself.
From the horse's mouth:
"Furthermore, we define the LTS to be:
and clearly state that it is not:
A Feature-Based Release: We will focus on hardening functionality of existing features, versus introducing new ones"