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. https://www.youtube.com/watch?v=FRumHQAqNu4

How to install VirtualBox Additions in ubuntu

video
Installing ubuntu guest os add-ons sometimes it is necessary to work in several operating systems simultaneously. in such cases, virtualization technologies come to the rescue, and in particular the virtualbox program. if you don’t know how to install ubuntu yet, you might be interested in this video tutorial.
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