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I upgraded a headless server from Ubuntu 12 to 14 following the built-in do-release-upgrade script. It seemed to run fine until I rebooted, and was left with an unusable machine. After the grub screen, all I get is a stream of messages that, after 30 minutes, haven't ended. The messages are streaming so quickly, I can't even see them well enough to google the errors.

How do I go about diagnosing this?

Also, how do I backup the hard drive? Using a LiveUSB, I'm able to see the hard drives, but I can't mount them because they're part of a software RAID. Running mount /dev/sdb1 /mnt gives me the error:

mount: unknown filesystem type 'linux_raid_member'

I read here that I might have to rebuild the array with mdadm, but is that possible from a LiveUSB that shouldn't be able to write to the drives?

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Cerin
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I think your LiveUSB doesn't have MD drivers built-in, and that's why it doesn't recognize the RAID members.

You need to see if you can manually load the MD module on your LiveUSB, or then find another boot media which has MD drivers available. For example, System Rescue CD is one option.

Tero Kilkanen
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  • Yes, following my link, I'm able to temporarily rebuild the array using mdadm in a LiveUSB, but I still don't know what caused the problem to begin with. – Cerin Apr 12 '15 at 15:23