I have a virtual machine running in VirtualBox of Ubuntu Server 14.04.1 LTS x64. When I initially set it up, I configured the VM to use EFI instead of BIOS.
But, it turns out VirtualBox's implementation of EFI is buggy and incomplete, so I'd like to switch it back to BIOS. However, turning off EFI for the VM fails to boot with an error stating it can't find any bootable media.
I tried to run the rescue mode of the Ubuntu Server installer. When I try to reinstall Grub, which I'm guessing is the right action, it fails. I'm trying to install it to /dev/mapper/vm--vg-root
which is where /
is listed as mounted when the VM does run.
So, how do I properly transition this VM from UEFI back to BIOS?