Downloaded the ISO file from ubuntu.com. Mounted the ISO file in a new Virtual Box VM. Ran the installer, which completed without any problems. Upon first boot, received a nasty fatal error message: This kernel requires the following features not present on the CPU: 0:6. Could go no further booting the VM. Just had to "power it off." Quick Google search led to a post in the Ubuntu forums. "Apparently in Virtual Box this error is corrected by: General -> Advanced -> check Enable PAE/NX." Yep, that worked. I now am able to boot into Ubuntu server and get to the ~$ prompt. Now if I only I knew what to do with that. Ah well, one step at the time.
Thanks to dcstar at the Ubuntu Virtualization forum for the fix.
More to come.