The image file ‘E:\Downloads\ubuntu-16.04-desktop-i386.iso’ is inaccessible and is being ignored. Please select a different image file for the virtual DVD drive..
I mounted my ubuntu .iso file. When I started the new and blank VirtualBox VM, I selected the mounted drive as the start up drive. The booting crashed with the above given error.
I dismounted it. I removed the virtual optical drive in the VM settings. Then I pointed the .iso file directly as DVD drive to resolve this issue.