I don't know why the KB procedure didn't work, but I was able to use the Boot Repair disk: https://help.ubuntu.com/community/Boot-Repair
The VirtualBox ability to mount bootable ISO's is quite handy. From an unbootable VM, I was able to boot BING (didnt' fix), gparted (didn't fix), and finally the Ubuntu boot repair, that worked.
The results indicate the issue was grub was corrupted? Perhaps there is a difference in the IFL-to-VM process in the KB to account for grub?
"=================== Recommended repair
The default repair of the Boot-Repair utility will reinstall the grub2 of sda1 into the MBR of sda.
Additional repair will be performed: unhide-bootmenu-10s
Unhide GRUB boot menu in sda1/etc/default/grub
lspci: Unable to load libkmod resources: error -12"