how to make a bootable ubuntu from already installed ubuntu?

I don't know this is a right question . But I want to know whether can I make a bootable Ubuntu for my friend from my already installed Ubuntu desktop ? I.e. I want to make a bootable copy of Ubuntu for installing to my friend PC . But I have a desktop which already contain Ubuntu OS . Any possible way to make a bootable Ubuntu from my already installed Ubuntu Desktop ? Any software or tool can I use ?

Copyright Notice：Content Author:「user39320」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/31073672/how-to-make-a-bootable-ubuntu-from-already-installed-ubuntu

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