[Bug 883720] Re: oneiric fresh install to raid1 from alt amd64 CD - "grub-install /dev/sda failed"

[Andrew Cranwell]

I'm having similar problems (installing grub under amd64 with mdadm
raid1). Two questions -  are you using GPT or MBR for your partition
tables, and is this system using BIOS or EFI?

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Title:
  oneiric fresh install to raid1 from alt amd64 CD - "grub-install
  /dev/sda failed"

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

Bug description:
  Installing to two new 3TB drives (/dev/sda and /dev/sdb). sda1 & sdb1
  are 1Mb and flagged as boot, sda2 and sdb2 are 2992GB, flagged as RAID
  and assembled as RAID-1 array MD0. sda3 and sdb3 are 8GB swap.
  Installer works OK up to the point where it installs the GRUB boot
  loader to /dev/sda. Then it fails with the message "grub-install
  /dev/sda failed". Retry fails again. Continue without boot loader
  shows no more errors but system will not boot after installer has
  finished. Looks like grub is in /boot (when /dev/md0 is mounted as /).
  Not sure what to do to get GRUB installed at this point...

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