Why does someone need to install Linux(Debian/fedora) distribution inside Android? I need some ideas from you. Why does someone need to install Linux distribution (Debian/Fedora) inside an android phone using android apps like 'Linux Deploy'?
This article has some good explanations. 

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  We can think of many reasons why you'd want a proper Linux PC in your pocket. You can, for example, use it to power a LAMP server that can run web apps and serve web pages. If you're a network admin, you can install your favourite Linux tools and turn the smartphone into a portable network troubleshooting or pen-testing device.