Unable to insert the virtual optical disk /usr/share/virtualbox/VBoxGuestAdditions.iso into the machine Ubuntu Desktop 18.04 (IAIB).



Could not mount the media/drive '/usr/share/virtualbox/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
Callee: IMachine {5047460a-265d-4538-b23e-ddba5fb84976}