Grub fails to boot linux after install on dual boot with RAID+LVM

[cwsupport]

Ive just been trying out new installs on a PC which was running Kubuntu 12.04.3 LTS (upgraded from Beta1). The 12.04 Beta 1 installed perfectly on this system and has been working for a long time. Essentially the system is fine so we can rule out related issues.

Trying to install all of the following:

Ubuntu Server 13.04
Ubuntu Server 13.10 daily current

Everything is fine, disk partitioning, RAID, LVM etc then grub fails on reboot and drops to grub rescue after "error: no such disk". Ive been unable to make a successful boot from the command line.

Essentially the system has 3 disks.

sda - 250GB seagate - Multiple partitions containing multi-boot Windows Vista64 bit and Windows XP 32bit.
sdb - 500GB seagate - see below.
sdc - 500GB seagate - see below.

Both sdb/sdc are configured as 2 partitions 1GB and 499GB forming two raid sets

md0 - 1GB for /boot
md1 - 499GB for LVM

The LVM has partitions for /, /home, /tmp and swap amongst others.

I have tried with the partitions using both ext4 and resiserfs and the result is the same - fails to boot and goes into grub rescue.

grub is referencing the drives as (muuid/blah).
In grub resuce ls shows (md/0) and (md/1) along with the various hd bits for each of the drives and partitions.

It should have booted without problem - it appears to be unable to find /boot properly.

[cwsupport (netsupport)]

Also fails on Ubuntu Server 12.04.3 LTS.

[cwsupport (netsupport)]

Problem looks to be caused by update grub using incorrect uuids.
blkid shows different uuids.

[cwsupport (netsupport)]

I have managed to get a system working.

Having rebooted using the install disk to 'Rescue Broken System'. Copied out the /boot to a temp dir, remade the /boot filesystem as ext2 (instead of ext4) and then restoring the /boot data. I then executed:

update-grub
grub-install /dev/sda
grub-install /dev/sdb
grub-install /dev/sdc

On reboot I saw the menu and everything works. Will investigate further. But I see little reason why this should have not worked initially but worked on re-running. As I understand it ext4 is supported as a /boot o/s on RAID using the built in ext2 module?

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for grub2 (Ubuntu) because there has been no activity for 60 days.]