[Bug 1357750] Re: Grub fails to install on software raid 1 + lvm + btrfs

[Launchpad Bug Tracker]

[Expired for grub2 (Ubuntu) because there has been no activity for 60
days.]

** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1357750

Title:
  Grub fails to install on software raid 1 + lvm + btrfs

Status in grub2 package in Ubuntu:
  Expired

Bug description:
   Currently due to
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1289977 my system
  is not bootable.  The work around instructions are to dpkg-reconfigure
  grub-pc.  However that does not work.  Here are the steps I take.

  1) Download netboot.iso
  2) dd netboot.iso onto usb drive
  3) reboot nonbootable laptop on usb drive
  4) Choose recovery menu option
  5) Choose launch shell with root mounted on /target
  6) cd /target/@
  7) mount --bind /dev dev
  8) mount --bind /proc proc
  9) mount --bind /sys sys
  10) chroot .
  11) bash
  12) dpkg-reconfigure grub-pc
  Results: /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?)
  Expected: Grub to be installed on /dev/sdb and /dev/sdc

  System information:
  /dev/sdb,/dev/sdc (/dev/sda is the usb recovery device right now) are both members of a raid 1 using mdadm /dev/md127
  /dev/md127 is a full lvm the volume group is called ds or /dev/ds, ubuntu didn't support swap on btrfs at the time
  The lvm is split into two logical volumes one for swap, and one for root
  The root lvm /dev/ds/root has the entire section given to a btrfs filesystem 
  The btrfs filesystem has four "labels" @, @apt-snapshot....release-upgrade-raring, @...release-upgrade-saucy, @...release-upgrade-trusty, @home

  lsb release output:
  Distributor ID: Ubuntu
  Description:     Ubuntu 14.04.1 LTS
  Release:            14.04
  Codename:       trusty

  Can I provide any additional information?

  I am going to try to reboot into a 14.04 ubuntu desktop and add bug
  reporting information into this.

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