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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1423796

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1423796

Title:
  Unable to mount lvmcache root device at boot time

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm experiencing with Vivid Vervet on a virtual machine and tried a
  new LVM feature, lvmcache. I made a cache for the root file system,
  rebuilt the initrd and rebooted the VM.

  At boot time, the system failed to activate the root LV. After some
  investigation, I found out, it's because the initrd is missing some
  essential stuff needed for activating a cached LV.

  The initrd was missing the dm-cache module. I regenerated the initrd
  with explicitly listing dm-cache in /etc/initramfs-tools/modules, but
  the system still can't boot up, because now it is missing the
  /usr/sbin/cache_check utility.

  As SSDs are becoming more and more common, I think it will be common
  to use them as cache for root file systems, thus it is mandatory to
  make sure that an initrd can mount an lvmcached root device when
  necessary, preferably without /etc/initramfs-tools/modules and other
  initrd hacking.

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