[Solved] Virtualbox: Could not mount the media/drive

VirtualBox comes with some software packages but they are meant to be installed inside the Virtual Machine to improve the performance of guest OS and add extra features like mouse pointer integration, shared folders, better video support, time synchronization, shared clipboard, drag'N'drop and so on. These packages shipped in an iso image file which you can find at VirtualBox installation location.

Problem

Many times while installing the virtualbox, we encounter an error like "Could not mount the media/drive" with error flag as "VERR_PDM_MEDIA_LOCKED".

VBoxGuestAdditions Error

Solution

The trick to solve this problem is really simple. Follow the below steps:

1. Shut down the guest OS.
2. Now in VM Manager click the relevant VM and click "Settings" tab.
3. Go to "Storage" menu.
4. In "Controller: IDE" section, locate the attachment "VBoxGuestAdditions.iso"
5. Right Click on the attachment "VBoxGuestAdditions.iso" and select "Remove Attachment". In the confirmation dialog box, click "Remove".
   
   
6. Now in the same "Controller: IDE" section, locate the little CD symbol.
   
                          
7. In a dialog box asking to add a virtual CD/DVD disk, select "Leave Empty".
   
                          
8. Click "OK" and start the VM.
   
   Now you should be able to install the VirtualBox Guest Additions inside the VM.