I followed this thread and solved my problem:
http://ubuntuforums.org/showthread.php?t=1077167
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/573477
Title:
Mdadm array fails to assemble on boot.
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@ md0 is not ready yet or not present. Continue to wait; or Press S to
skip mount or M for manual recovery'
I have this bug in 10.10 and it's really anoying me. I wonder if there
is ever going to be a fix for this problem.
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