It would be interesting to know:

- if Secureboot is on or off (if at all supported)

- the shim version installed

- increase grub debugging and capture more detailed debug messages from
grub

- vmlinuz and/or initrd are corrupted, or the disk itself is in need of
fsck

- if using `linux-azure` yields better results, instead of `linux-
generic`

We could also escalate this to Azure / Microsoft as well.

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https://bugs.launchpad.net/bugs/1918265

Title:
  Random boot failure with Ubuntu 20.04 / grub 2.04 and Hyper-V 2012r2

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