I am working with

  • MacOS (Host)
  • Virtual Box 6.0.8
  • Ubuntu Desktop 18.04 (Guest)
  • Ubuntu Server 18.04 (Guest)

Was possible install without any problem both OS (Desktop and Server), both can run in peace.

For the Ubuntu Desktop I was able to use the .iso file to install the Guest Additions

The problem is for the Ubuntu Server it is not possible install the Guest Additions.

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I always receive the following error:

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I read many posts through this kind of question/answer network, and nothing, they mostly indicate to remove and reinstall the .iso (in my case about Controller: IDE for the Server) and/or not having the iso installed twice (in my case again about Controller: IDE for the Desktop). I did do both and nothing.

Thus I have: observe below for the Desktop I removed the iso from Controller: IDE because it was installed successfully and is not needed it anymore:

enter image description here

And Controller: IDE remains for Server

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But the error remains.

Therefore wondered what is happening:

  • Why was possible have a successfully installation for the Desktop and not for the Server?
  • I have this situation having either server running or Desktop and Server running

What to do?, what is missing?

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