I have a SuperMicro box with an Areca RAID controller installed. The RAID controller is configured for RAID 6 + Hot Spare. I am attempting to install Ubuntu 12.04 LTS. I set up LVM with separate partitions for /, /var, swap, and /data. While progressing through the installer, I get repeated failures at the Grub install step: "Unable to install grub /dev/sda" -- attempting to manually specify the location where Grub should be installed (presumably /dev/mapper/vg0-root) yields a similar result.

LVM Configuration: enter image description here enter image description here

The installation step that triggers the failure: enter image description here

Error: enter image description here enter image description here

  • Crap. I've seen this very error, but the documentation for how I fixed it is at a workplace I no longer work for. It involved going into text mode to reorder some things in grub and THEN applying, but that's all I got. – sysadmin1138 Feb 26 '14 at 3:27
  • Do you have a /boot partition ( outside of lvm of course ) ? – Olivier S Feb 26 '14 at 6:48
  • No I do not. Should I try placing /boot outside of LVM? – sardean Feb 26 '14 at 13:07
  • 2
    52TB in a single RAID6 volume? I hope you never need to rebuild your RAID. – Vinícius Ferrão Jun 25 '15 at 23:23

I resolved this issue by destroying the LVM and placing a small 2MB grub-bios partition at the beginning of /dev/sda. I presume, but cannot confirm, that that wasn't ample space for grub to install. From what I have read, GRUB has become so bloated it now extends beyond the bounds of sector 0. I am not sure if anyone might be able to confirm my theory.

  • 2
    Nope, 2MB is the normal and recommended size for a BIOS boot partition on a GPT formatted disk. The size has nothing to do with grub. – Michael Hampton Mar 7 '14 at 1:28
  • @MichaelHampton so if I understand you correctly you are saying that because this is not a GPT formatted disk that it was not a matter of space? Do you have any thoughts as to what might have resolved my issue? I am glad the issue is resolved but would prefer to understand why this actually seemed to resolve the issue. Any thoughts? – sardean Mar 7 '14 at 1:35
  • No, it is a GPT formatted disk. You could not have created a 52 TB partition otherwise. – Michael Hampton Mar 7 '14 at 1:37
  • @MichaelHampton I apologize, so are you saying it was simply the addition of the 2MB grub-bios partition at the beginning of the disk that was requisite for the grub install - but that it was not a matter of size itself. – sardean Mar 7 '14 at 1:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.