How to Capture Screenshot and Segment of Screen in Linux/Ubuntu

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How to take a screenshot in Linux/Ubuntu:
The main motivation for creating this tutorial comes from the fact that you will often need to take screenshots of your code if you are developing a program and at the same time you are writing a scientific report or a graduate thesis. Also, I created this tutorial since I often switch between Windows and Linux, and often forget how to properly take screenshots in Linux.
We will learn how to take screenshots of
1) Complete screen
2) Section of the screen
3) Currently active window

source

ubuntu