I'm trying too, but this is a really deep dive for me!
Boot appears to go alright, systemd journal is starting, first error is:
emergency.service: /failed at step EXEC spawning /bin/plymouth: No such file or directory
boot.mount: Directory /boot to mount over is not empty, mounting anyway
Finally,: Failed to mount /boot.
There are also quite a few Fails related to virtualbox: "Failed to lookup alias 'vboxdrv': Function not implemented"