How to install the Guest Addition in Ubuntu OS by Oracle Virtual Box

I have a lot of development in Linux Application but my PC must in Windows because of the outlook & skype (company version). So I create a Ubuntu Guest on Win7/Win10. To make the clipboard and share folder work I need install the guest addition.

At the beginning it troubled me until I found the solution here:
https://askubuntu.com/questions/573596/unable-to-install-guest-additions-cd-image-on-virtual-box

It is simple, isn't it?
sudo apt-get install virtualbox-guest-utils

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