My cdrom is IDE and all my disks are SATA, there is no reason for the IDE disk to change the order of the SATA disks. I have two identical SATA disks, 80G and one 300G. Seems Ubuntu wanted to recognise the biggest disk as the first one. Once I removed the 300G, installed and then put back the 300G it all worked. My motherboad clearly indicates which sata cable is which disk, 1,2,3 or 4. the 300G was #3 and still the installer wanted to make it #1.
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