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I installed ubuntu server 10.04 on a PC with two HD drives 500 GB each. I used raid1 to provide data protection. The /boot partition is installed also on a mirrored device /dev/md0.

After the installation has completed, the system did not boot properly. I got the following error message:

ALERT! /dev/disk/by-uuid/<long characters> does not exist. Dropping to a shell!

Any idea what could cause such a problem?


I booted into rescue mode using the installation CD. Executing fdisk showed me the partitions, but it said "Partition 1 does not end on cylinder boundary.". Can this be related to the problem at hand?


I re-installed ubuntu server without the Raid at all. The system booted as it should be! Also, I got the same error from fdisk after booting. So, this error should not be related to this problem of not being able to boot.

It is puzzling me. Can't I install ubuntu server 10.04 with raid1?!!

share|improve this question

Probably either the initramfs didn't include a raid hook.Assuming it happens after the grub menu.But why don't you use btrfs built-in raid1?

share|improve this answer
I think Grub doesnt support btrfs now – Extender Nov 15 '10 at 9:26
I updated my question! – Khaled Nov 15 '10 at 11:40

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