How to make screencast on Ubuntu 14.04

There is a lot of software for screencasting, subtitles making and video mastering for Ubuntu and you can create awesome demo with a lot of effects.
But what if you want to create a simple demo by using only free software?
Unfortunately I could not find a one application for Linux to screencast, create subtitles and add subtitles to the video. I had to use 4 different applications.
So I'm going to tell you how to:

• Create screencast video
• Create subtitles with the custom style
• Add subtitles to the video

How To install Ubuntu 15.04 on laptop with Windows 8 and UEFI

Let's install Ubuntu 15.04 with KDE (Kubuntu) on laptop with UEFI (in my case it was ASUS N56JR):

STEP 0: Get Kubuntu ISO

• Go to http://www.kubuntu.org/getkubuntu/
• Download Kubuntu 15.04 iso
• Burn DVD with ISO

STEP 1: UEFI

• Open UEFI menu (in my case I did it by pressing F2 just after I pressed power button on my laptop)