I added a reference to this bug to the ISO tracker, however I currently
can't reproduce it. Booting the installer ISO on a POWER8 machine with:

  qemu-img create -f raw disk2.img 8G
  kvm -m 1024 -boot d -cdrom eoan-server-ppc64el.iso -drive 
file=disk.img,if=virtio

or with:

  kvm -m 1024 -boot d -cdrom eoan-server-ppc64el.iso -drive
file=disk.img

just works. The boot with if=virtio briefly shows this kernel message
before the d-i actually starts:

  vio vio: uevent: failed to send synthetic uevent

but after a short while I get to the installer, and I'm able to install.
This is tested with:

  $ bsdtar -x -f eoan-server-ppc64el.iso -O .disk/info
  Ubuntu-Server 19.10 "Eoan Ermine" - Beta ppc64el (20190926)

but 20190926.1 does not seem to behave differently. I'm very willing to
expand the tests cases to catch this issue, however I first need to be
able to reproduce it. Do you already have a reproducer?

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https://bugs.launchpad.net/bugs/1845572

Title:
  udevadm trigger will fail when trying to add /sys/devices/vio/

Status in linux package in Ubuntu:
  In Progress

Bug description:
  [Impact]
  This will cause the installer to exit early, causing a kernel panic before 
any prompt to the user. This is restricted to some Power systems.

  [Test case]
  A build vmlinux was used to boot the installer, and a prompt was available.
  'add' was written to /sys/devices/vio/uevent was written to, and no error was 
found.
  'add' was written to /sys/devices/vio/*/uevent, and modalias information was 
found when 'udevadm monitor -p' was run in the background.

  [Regression potential]
  Events may be missing and coldplug/hotplug of vio devices may fail. That was 
tested in the test case and not found to be the case.

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