I have this problem on Dell Optiplex 980 using the BIOS raid. 10.10 worked ok, reboot after upgrade to 11.04 fails. Noticed the BIOS raid status was Initialise when it should say Normal. Another identical machine here also had intermittent success, but after upgrading BIOS from A01 to A08 it works about 4 out of 5 times. Mine is hard failing even after the BIOS upgrade.
I have this problem on Dell Optiplex 980 using the BIOS raid. 10.10 worked ok, reboot after upgrade to 11.04 fails. Noticed the BIOS raid status was Initialise when it should say Normal. Another identical machine here also had intermittent success, but after upgrading BIOS from A01 to A08 it works about 4 out of 5 times. Mine is hard failing even after the BIOS upgrade.