[Solved] Cannot attach medium '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso'

[raed707]

Hello,

After I updated the extension pack my Ubuntu virtual machine got inaccessible

Cannot attach medium '/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso' {0e3ca4cf-63fe-432c-aa09-079e300a8844}: medium is already associated with the current state of machine uuid {986e5190-68cc-4c04-82f8-ea65133d3008}!.

Result Code: VBOX_E_OBJECT_IN_USE (0x80BB000C)
Component: MediumWrap
Interface: IMedium {ad47ad09-787b-44ab-b343-a082a3f2dfb1}

[socratis]

Let me translate what's going on here...

• You took a snapshot, while the VM had the "VBoxGuestAdditions.iso" mounted. The ISO had "a" UUID.
• You upgraded VirtualBox. The "VBoxGuestAdditions.iso" got "a new" UUID.
• The UUIDs are conflicting, you can't have the same ISO with two UUIDs

I would like to see the recipe of the VM, the ".vbox" file. Right-click on the VM in the VirtualBox Manager, select "Show in Finder". ZIP the selected ".vbox" file and attach it to your response.

[raed707]

I couldn't do show in finder, but I got the .vbox file from Macintosh SSD⁩ ▸ ⁨Users⁩ ▸ ⁨user⁩ ▸ ⁨VirtualBox VMs⁩ ▸ Ubuntu

The requested file is attached.

Thank you

[socratis]

I couldn't do show in finder

That's interesting... Can you elaborate?

I got the .vbox

1. Launch "Activity Monitor.app". Menu "View" » "All Processes" » click on the "Process Name" header to sort them by name.
2. Quit VirtualBox. Then on the "Activity Monitor" make sure that there's no "VBoxSVC" process.
3. Open Macintosh SSD⁩ ▸ ⁨Users⁩ ▸ ⁨user⁩ ▸ ⁨VirtualBox VMs⁩ ▸ Ubuntu ▸ Ubuntu.vbox with a text editor (TextWrangler, Atom, TextEdit). Delete the following 4 lines (I added the line numbers to help you find them):

   14       <DVDImages>
   15         <Image uuid="{126dfdde-1b76-4dce-88a5-b1f30a893bb7}" location="/Users/user/Downloads/ubuntu-18.04.3-desktop-amd64.iso"/>
   16         <Image uuid="{0e3ca4cf-63fe-432c-aa09-079e300a8844}" location="/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso"/>
   17       </DVDImages>

4. Save the file, start VirtualBox, launch the VM.

If this procedure is not too easy for you, let me know and I'll post the vbox file...

[raed707]

Thank you very much it worked!

I was trying to fix the problem of not being able to go fullscreen on the virtual machine
and I think I Inserted Guest Additions CD twice because I tried to install it many times with no success.

Now I have my OS running again thanks to you but with the same first problem of not being able to go fullscreen.
Do you have any advice on this problem?

I appreciate your help

[socratis]

not being able to go fullscreen. Do you have any advice on this problem?

Yes! Open a new thread with a matching title, because this one is getting marked as [Solved]. We like to observe the "One issue, one thread" rule...