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[Launchpad Bug Tracker <1532146@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package initramfs-tools - 0.120ubuntu7

---------------
initramfs-tools (0.120ubuntu7) xenial; urgency=medium

  [ Ben Hutchings ]
  * hook-functions: Include drivers/nvme in block driver modules (Closes:
    #807000) (LP: #1524879)

  [ Louis Bouchard ]
  * Add support for NVME devices when MODULES=dep is used (LP: #1532146)

 -- Andy Whitcroft <apw@xxxxxxxxxx>  Thu, 21 Jan 2016 16:10:15 +0000

** Changed in: initramfs-tools (Ubuntu)
       Status: In Progress => Fix Released

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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:
  Fix Released
Status in initramfs-tools source package in Wily:
  New

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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