I've got exactly the same issue, running OS X 10.8 (Mountain Lion) and trying to boot a Kubuntu 12.04 64-bit Live CD on a flash drive. I get the "Missing operating system" error on my brand new AMD A8-3870K desktop.
I've got exactly the same issue, running OS X 10.8 (Mountain Lion) and trying to boot a Kubuntu 12.04 64-bit Live CD on a flash drive. I get the "Missing operating system" error on my brand new AMD A8-3870K desktop.