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[Dan Streetman <dan.streetman@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1771557

Title:
  NVMe boot drives not supported - failing in generating initramfs

Status in initramfs-tools:
  Fix Released
Status in initramfs-tools package in Ubuntu:
  In Progress
Status in initramfs-tools source package in Trusty:
  In Progress
Status in initramfs-tools source package in Xenial:
  Fix Released

Bug description:
  [Impact] 
  The initramfs-tools hook-functions script cannot translate nvmeXnYpZ to nvmeXnY block device, so it's failing and not building the initram disk.

  Upstream solution is composed for at least 2 patches (it's a series,
  but the 2 below are really the needed ones):

  commit 3cb744c9
  Author: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
  hook-functions: Rewrite block device sysfs lookup to be generic

  commit 8ac52dc0
  Author: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
  hook-functions: Include modules for all components of a multi-disk device

  Instead of doing the backport, which is huge, we added another sed substitution: currently the script has substitutions for sdX and hdX, in order to convert sda1 to sda, for example. The new substitution converts nvmeXnYpZ to nvmeXnY.
  It's less intrusive than the full backport, since this is a SRU to Trusty only.

  
  [Test Case]
  To be added.

  
  [Regression Potential] 
  If the sed expression was somewhat broken, we could have an issue generating initiramfs for generic block devices, like regular HDDs.

  
  [Other Info]
  This issue is based on Debian bug #785147: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785147

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