xubuntu 12.10 on core duo imac - only boots via alt/option key then select disk

[Wes James]

I pulled out an old core duo iMac and put xubuntu 12.04 x32 on it.  When it
boots I get the disk not found icon.  If I boot, then press the alt key to
show the bootable disks, it shows me a "windows" disk, which I then press
enter on as it is the only option, it then boots.  How do I get it to boot
without needing to do this?

I then got xubuntu 12.10 x32 - then realized before installing that the
system still had a guid partition so I booted up an os x install disk and
repartitioned with master boot record partition.  I installed 12.10, but I
still get the disk not found and the alt key at boot does work again
scenario...

Thanks,

Wes
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