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Virtual box guest additions in elementary

I have gone through the article posted in

I followed the advises and when proceeded for select Devices > Insert Guest Additions CD image . I found Virtual Box error message - “Unable to insert the virtual optical disk /usr/share/virtualbox/VBoxGuestAdditions.iso into the machine ELEMENTARY.”

Therefore, I couldn’t proceed further. I would like to know as to how I clear the deadlock.

I think there is a button “Force Unmount”. Click this button.