Install Guest Addition VirtualBox (ubuntu)

This is a quick guide to Install Guest Addition VirtualBox in Ubuntu.
Step by Step Guide: www.geekrar.com/how-to-instal...
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Full Ubuntu in VirtualBox guide: • How to Install Ubuntu ...
Ubuntu on VMware: • How to Install Ubuntu ...
Install VirtualBox and Extension Pack: • How to Install Virtual...
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whats the difference? I'm having a sudo issue that says user is not found in file.