When inserting Guest Additions CD Image in a Debian VM you are getting VERR_PDM_MEDIA_LOCKED
Solution:
There are many solutions, like:
1) Executing
sudo apt-get upgrade
sudo apt-get install virtualbox-guest-additions-iso
2) Removing and inserting the cd from the VM configuration
and a third one which is the one that worked with me:
a) Start the VM
b) Open a terminal
c) Execute this:
sudo su
cd /media
mkdir cdrom
mount /dev/cdrom /media/cdrom
cd cdrom
sh VBoxLinuxAdditions.run
Hope this helps.
Alejandro,
