[Bug 1587889] Re: Installing grub on '/dev/md126p1 system doesn't boot

[Mathieu Trudel-Lapierre]

I just did a full install with RAID on a VM; I set up two full disks
(clean partition table) as RAID1 and used Guided to write partitions to
RAID1 array. Install completed successfully and appears to boot just
fine.

The only thing that was not tested was booting with RAID degraded, but
it otherwise all looks like things behave the way they should; ergo, I
can't reproduce the issue.

Could you please add more information as to how you're doing the
partitioning, if you're setting special RAID metadata settings, etc?

** Changed in: grub-installer (Ubuntu)
       Status: New => Incomplete

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Title:
  Installing grub on '/dev/md126p1  system doesn't boot

Status in grub-installer package in Ubuntu:
  Incomplete

Bug description:
  Installed, xenial, machine wont boot.

  machine has 
  lspci ...
  00:1f.2 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 02)
  two disks that show up as sda/b

  pxe net install, preseed disk options:

  d-i user-setup/encrypt-home boolean false

  # d-i partman-auto/disk string /dev/sda
  d-i partman-auto/method string regular
  d-i partman-auto/choose_recipe select atomic

  # This makes partman automatically partition without confirmation.
  d-i partman-md/confirm boolean true
  d-i partman-partitioning/confirm_write_new_label boolean
  d-i partman/choose_partition select finish
  d-i partman/confirm boolean true
  d-i partman/confirm_nooverwrite boolean true

  d-i grub-installer/only_debian boolean true
  d-i grub-installer/with_other_os boolean true

  Installer syslog shows:

  May 31 22:03:46 grub-installer: info: Installing grub on '/dev/md126p1'
  May 31 22:03:46 grub-installer: info: grub-install does not support --no-floppy
  May 31 22:03:46 debconf: --> INPUT low grub-installer/force-efi-extra-removable
  May 31 22:03:46 debconf: <-- 30 question skipped
  May 31 22:03:46 debconf: --> GO
  May 31 22:03:46 debconf: <-- 0 ok
  May 31 22:03:46 debconf: --> GET grub-installer/force-efi-extra-removable
  May 31 22:03:46 debconf: <-- 0 false
  May 31 22:03:46 grub-installer: info: Running chroot /target grub-install  --force "/dev/md126p1"
  May 31 22:03:46 grub-installer: Installing for i386-pc platform.
  May 31 22:03:59 grub-installer: grub-install: warning: File system `ext2' doesn't support embedding.
  May 31 22:03:59 grub-installer: grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
  May 31 22:03:59 grub-installer: Installation finished. No error reported.
  May 31 22:03:59 grub-installer: info: grub-install ran successfully
  May 31 22:03:59 debconf: --> GET grub-installer/make_active
  May 31 22:03:59 debconf: <-- 0 true
  May 31 22:04:00 debconf: --> PROGRESS STEP 1
  May 31 22:04:00 debconf: <-- 0 OK

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