Public bug reported:

On Ubuntu 18.04 LTS 1&2 (so far tested), either when deploying a new VM
(which pulls the latest linux-generic) or rebooting a VM (which updated
the linux-generic under the cover which installs 4.15.0-136) will
prevent the VM to boot.

After reboot, will get stuck on /dev/sdX: clean, x / y files, k / m
blocks.

Using grub, selecting an older kernel, allow the VM to book without any
issues.

I manually installed kernel 4.15.0-135, however the issue doesn't repro.

Finally I've verified that this repro on both Server 2016 and Server
2019 versions of Windows...

Output of /proc/version_signature (both on Server 2016/2019)
Ubuntu 4.15.0-29.31-generic 4.15.18

lspci -vnvn reported empty on this VM.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "output.png"
   https://bugs.launchpad.net/bugs/1917958/+attachment/5473666/+files/output.png

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https://bugs.launchpad.net/bugs/1917958

Title:
  Latest linux-generic package (kernel 4.15.0-136) doesn't work on
  HyperV Gen2 VM

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