Comment 13 for bug 1814069

Confirming for both 4.15.0-44 and 4.15.0-45 on Windows Server 2012 Hyper-V. For now I've forced GRUB to boot 4.15.0-43.

The guest is Ubuntu Server 18.04.1. FWIW, the VM has 2 virtual cores and dynamically-allocated memory of up to 6144 MB.

I'm only able to view the boot process in Hyper-V's "Virtual Machine Connection" console, which has no scroll buffer. When boot failure occurs, I can see the last few lines of an error trace in the console, but I've been unable to capture the full trace. No information regarding the boot ends up in the system logs--i.e., journalctl doesn't recognize the failed boot attempts at all.