Also affects 18.04

The "easiest" fix I can see is to add the raid1 and raid10 modules to
the manually added modules in /usr/share/initramfs-tools/hooks/lvm2
(dm_raid.ko depends on raid456.ko, but not raid1.ko or raid10.ko)

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https://bugs.launchpad.net/bugs/1509717

Title:
  Wily LVM-RAID1 – md: personality for level 1 is not loaded

Status in initramfs-tools package in Ubuntu:
  In Progress
Status in linux package in Ubuntu:
  Invalid
Status in lvm2 package in Ubuntu:
  In Progress
Status in lvm2 package in Debian:
  Unknown

Bug description:
  After upgrading to Wily, raid1 LVs don't activate during the initrd
  phase. Since the root LV is also RAID1-mirrored, the system doesn't
  boot.

  I get the following message each time LVM tries to activate a raid1 LV:
  md: personality for level 1 is not loaded!

  Everything was fine with Vivid. I had to downgrade to Vivid kernel
  (3.19.0-30) to get my system to a usable state. I pretty much hope it
  to be a temporary workaround and I'll get the new 4.2.0 kernel work
  with Wily in days.

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