Hello, My Sony Vaio laptop was running dual boot Vista and Ubuntu 9.10, booting into Ubuntu first. I downloaded W8 to upgrade Vista, but managed to miss the moment when the machine rebooted. As a result, nothing worked any more. I could not get the machine to booti from a Windows disk, or anything else except Ubuntu disk. I have now reinstalled Ubuntu and upgraded it to 10.04. I have checked in the BIOS that it should boot from optical disk, but it will not comply. What can I do, please?