[Bug 1315344] Re: Grub install failed on disks with software RAID

[shane freeder]

so, I just hit this issue using a custom install script running from a
custom live CD, however I've managed to find where my issue was, just
somehow happened to end up finding this page.

The issue was when I ran the grub install command, it would fail with
the message that it can't find the md1 device.

I eventually noticed that for some strange reason, mdadm wasn't
installed inside the chroot even though I'd told it too. Running apt-get
install mdadm fixed the issue for me, so chances are mdadm isn't being
installed into the chroot, so this is technically an issue with the
ubiquity, I'd say, and not grub.

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https://bugs.launchpad.net/bugs/1315344

Title:
  Grub install failed on disks with software RAID

Status in “grub-installer” package in Ubuntu:
  Confirmed

Bug description:
  I've got two 2TB drives set up with identical partitions, which are combined into RAID1 arrays (five mirrors across the two disks).
  On a free RAID1 I've installed Trusty 64bit from the Desktop installer ("try Ubuntu" first, install mdadm, run mdadm --assemble --scan, then start installer). I then wanted grub to be installed onto /dev/sda and /dev/sdb, but both fail.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubiquity 2.18.7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.340
  Date: Fri May  2 13:05:29 2014
  InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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