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[Louis Bouchard <louis.bouchard@xxxxxxxxxxxxx>]

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785147 provide a fix
for this issue in the version in experimental. This is not yet in Sid so
not merged into Xenial

** Bug watch added: Debian Bug tracker #785147
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785147

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https://bugs.launchpad.net/bugs/1532146

Title:
  update-initramfs fails for MODULES=dep when root is on nvme device

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  If MODULES=dep is used to create a smaller initramfs, it will fail if
  the system has its root on NVME device.

  # grep ^MODULES /etc/initramfs-tools/initramfs.conf 
  MODULES=dep
  # update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-3.19.0-43-generic
  mkinitramfs: for root /dev/nvme0n1p1 missing nvme /sys/block/ entry
  mkinitramfs: workaround is MODULES=most
  mkinitramfs: Error please report the bug
  update-initramfs: failed for /boot/initrd.img-3.19.0-43-generic with 1.

  /usr/share/initramfs-tools/hook-functions is missing an entry for NVME
  devices so it falls back to a default value which is inadequate

  I will open a bug in Debian as well which has the same issue in Sid.

  The upcoming version in experimental changes the logic which may or
  may not fix the problem.

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