I use Fixed Size Storage. After cloning and moving a .VDI to a new machine, so that I could increase the size of the Virtual Hard Drive, I ran into issue where the VBoxGuestAdditions.iso would not mount properly, no matter what I tried. I searched through these forums and other various sites for a solution. Below is what fixed it for me, I hope this will save others some time.
Code: Select all
sudo apt-get install virtualbox-guest-additions-iso
Tags: VERR_PDM_MEDIA_LOCKED, Unable to mount Guest Additions, Force Unmount, VBoxGuestAdditions.iso failed to mount