LucidCode's Unity Development: Tensorflow - 0 - Install Ubuntu and First setting in Ubuntu environment

Howdy guys ~~~ it's lucid
today ! we'll set TensorFlow development environment
you'll be curious about why i'm posting about TF instead of posting Unity
The answer of that question is just because i have to study TensorFlow to work at my new job , Korea Institute of Science and Technology !
Anyway , let's start !
frankly, explanation about 'how can we set up TensorFlow' is obviously posted on official site of it
but i got some problem and experience something difficult, so i'll post focus on unexpected problem which is expected during setting TF

The TensorFlow require unlimited hardware , in other words , you can use TF on from a smart phone to the hyper computer which use hundreds of GPU
so you don't have to care about your computer specification when you want only study TF
then the first sequence is install Linux OS
in my case, I chose Ubuntu for my Linux environment

https://www.ubuntu.com/download/desktop

here is a link to download Ubuntu 16.04 (by today 17-01-17)
after download it , you have to make booting USB (or DVD)
but I had not DVD , so I made booting USB for install Ubuntu OS

for making booting USB , you must have USB(at least 4GB)
and you need additional software for making booting USB , I used Universal USB

https://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/#button

here is also a link to download Universal USB
if you download it completely , it's time to make booting USB