Public bug reported:

[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.

** Affects: linux (Ubuntu)
     Importance: Critical
     Assignee: Thadeu Lima de Souza Cascardo (cascardo)
         Status: In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu)
       Status: New => In Progress

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

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

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