Not able to "Insert Guest Additions CD image" on 4.3.18

[micwic]

I'm not able to install Guest Additions by using Insert Guest Additions CD image or by using manual procedure from my W7 64 bits host in my linux ubuntu 64 bit guest.

I got an exception Could not mount the media/drive ... (VERR_PDM_MEDIA_LOCKED)

Code d'erreur : E_FAIL (0x80004005) Composant : Console Interface : IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6} Fonction appelée : IMachine {480cf695-2d8d-4256-9c7c-cce4184fa048}

[micwic]

Previous installation log

[micwic]

To reproduce :

1. install virtual box 4.3.18
2. create a new virtual machine with ubuntu 14.04 server lts distribution (ubuntu-14.04.1-server-amd64.iso)
3. login and install dkms
4. click on menu item in machine window dialog box or type Host+D (you got the error)
5. same error by mounting the file manually by using CD/DVD menu

[Frank Mehnert]

Sorry, that's not a bug. The error code VERR_PDM_MEDIA_LOCKED means that the virtual CD medium is locked by the guest. The same could happen on real hardware if you are not able to open the CD tray. It usually means that the guest is accessing a file on the virtual CD medium. Eject the medium from the guest and you will be able to mount the Additions ISO successfully.

[micwic]

I'm not using a CD, i'm clicking the menu item from virtualbox menu bar. The iso file is the file contained in the windows host. The file is here. The file is not accessed by anybody else, all the other vm's are stopped.

[micwic]

Testing exactly the same in a new machine running w7 as host after installing virtualbox 4.3.20. It was not possible to mount guest additions by using the menu but it was possible to mount it manually and execute it successfully. The log was full and everything went well. Restarting the machine was ok and service was launching correctly. Don't know why this is not working in the other machine after upgrading to 4.3.20.