When I try to boot the default grub selection, I see a group of repeating messages:
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Failed to start Light Display Manager. See systemctl status lightdm.service for details
Starting Detect the available CPUs and deal with any system changes
Finished Detect the available CPUs and deal with any system changes
See systemctl status gpu-manager.service for details
Next failure I see is for NTP daemon. "See systemctl status ntp.service for details".
And from here it loops on the "Failed to start Light Display Manager." messages that I described above.
Because this is a VM, I can restore the VM to a previous state and try again. I discovered that if I boot to recovery mode, and then tell it to continue booting, it will boot to a command prompt, and prompt me for a login. I can successfully login, and then run startx. My desktop is there, networking is working, and I can run all the software (system installed and installed by me.) Automated display resizing by VirtualBox is not working. I tried reinstalling Guest Additions, that didn't help.
After getting a desktop, I took a look at /var/log/lightdm/lightdm.log, and I see the following:
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[+0.02s] DEBUG: Seat seat0: Creating greeter session
[+0.02s] DEBUG: Seat seat0: Failed to find session configuration lightdm-webkit-greeter
[+0.02s] DEBUG: Seat seat0: Failed to create greeter session
[+0.02s] DEBUG: Failed to start seat: seat0
Thanks.