[Bug 527401] Re: grub-installer fails to install on a raid1 array

[Gustavo A. Díaz]

This bug still exist in 18.04... Ubuntu installer always fails at the
end when installing on RAID (in my case, RAID 1 and UEFI) and have to
manually reinstall GRUB.

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Title:
  grub-installer fails to install on a raid1 array

Status in grub2 package in Ubuntu:
  Fix Released
Status in partman-base package in Ubuntu:
  Fix Released
Status in grub2 source package in Lucid:
  Fix Released
Status in partman-base source package in Lucid:
  Fix Released

Bug description:
  Binary package hint: grub-installer

  While trying to install a raid5 with /boot on raid1 system using
  preseed, grub-install fails to install correctly:

  Feb 24 21:43:59 grub-installer: info: Installing grub on '/dev/vda /dev/vdb /dev/vdc'
  Feb 24 21:43:59 grub-installer: info: grub-install supports --no-floppy
  Feb 24 21:43:59 grub-installer: info: Running chroot /target grub-install  --no-floppy --force "/dev/vda"
  Feb 24 21:44:00 grub-installer: /usr/sbin/grub-probe: error:
  Feb 24 21:44:00 grub-installer:  
  Feb 24 21:44:00 grub-installer: no mapping exists for `md0'
  Feb 24 21:44:00 grub-installer: .
  Feb 24 21:44:00 grub-installer: Auto-detection of a filesystem module failed.
  Feb 24 21:44:00 grub-installer: Please specify the module with the option `--modules' explicitly.
  Feb 24 21:44:00 grub-installer: error: Running 'grub-install  --no-floppy --force "/dev/vda"' failed.

  I've attached the installation syslog run with DEBCONF_DEBUG set to
  developer.

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