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Unable to Install Guest Additions CD Image on Virtual Box

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Original source (askubuntu.com)
Tags: ubuntu virtualbox askubuntu.com
Clipped on: 2017-01-05

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Error when I clicked on Insert GuestAdditions CD Image from "Devices"

Unable to insert the virtual optical disk /Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso into the machine VirtualUbuntu.
Would you like to try to force insertion of this disk?
Could not mount the media/drive    '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).

Result Code: 
NS_ERROR_FAILURE (0x80004005)
Component: 
Console
Interface: 
IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}
Callee: 
IMachine {480cf695-2d8d-4256-9c7c-cce4184fa048}

I can see VBoxGuestAdditions under VirtualBox list

homeuser@ubuntu:/usr/share/virtualbox$ ls -l
drwxr-xr-x 2 root root 4096 Jan 14 12:46 nls
-rw-r--r-- 1 root root 64647168 Apr 7 2014 VBoxGuestAdditions.iso
-rwxr-xr-x 1 root root 2176 Apr 6 2014 VBox.sh
-rwxr-xr-x 1 root root 4161 Apr 7 2014 VBoxSysInfo.sh

Any suggestion(s)?