ubuntu upgrade to 12.10 in system which have raid5

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http://askubuntu.com – I just upgraded ubuntu from 12.04 to 12.10. Now in boot it won't start. My system has one hdd(where ubuntu is) and 4 1.5 tb sata drives in software raid5 configuration. In upgrade process it said some thing about raid. I think it tries boot from raid. Is there anything to fix this problem (HowTos)