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[Launchpad Bug Tracker <1716818@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mdadm - 3.3-2ubuntu7.4

---------------
mdadm (3.3-2ubuntu7.4) xenial; urgency=medium

  * Drop versioned dependency on initramfs-tools, which was only needed for
    upgrades and now keeps initramfs-tools installed on systems that don't
    need it.  LP: #1716818.
  * Guard calls to update-initramfs -u in the maintainer scripts for a
    check that the script is present.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Wed, 13 Sep 2017
03:52:18 +0000

** Changed in: mdadm (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1716818

Title:
  Remove obsolete versioned dependency on initramfs-tools

Status in mdadm package in Ubuntu:
  Fix Released
Status in mdadm source package in Xenial:
  Fix Released

Bug description:
  [SRU Justification]
  In xenial and earlier, mdadm declares a versioned dependency on initramfs-tools.  This was an Ubuntu-specific dependency only needed for upgrades, and the version referenced is ancient (ca. 2008).  In zesty and later, the dependency has been removed.

  Since this is no longer relevant for upgrades and we would not
  otherwise have a dependency on initramfs-tools, we should drop this
  dependency to support building of images with initramfs-tools removed
  for systems that we know don't require an initramfs.

  [Test case]
  1. On a xenial default cloud image install, try to run 'sudo apt purge initramfs-tools'.
  2. Verify that this tries to remove mdadm.
  3. Cancel the removal.
  4. Install mdadm from xenial-proposed.
  5. Run 'sudo apt purge initramfs-tools' again.
  6. Verify that mdadm is not removed.
  7. Run 'sudo apt install --reinstall mdadm' and confirm that the package can be installed successfully without initramfs-tools installed.

  [Regression Potential]
  If a user needs an initramfs in order to mount their root device (whether or not it's on RAID), and mdadm is the only package on their system which depends on initramfs-tools, it is possible that the user may remove initramfs-tools and render their system unbootable.

  This is unlikely because initramfs-tools is still part of the
  'minimal' seed and is therefore a dependency of ubuntu-minimal; and it
  remains a dependency of the generic kernel image.

  So long as initramfs-tools is installed, mdadm's initramfs hooks will
  continue to function as intended when required.

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