This question already has an answer here:
iMac i3 running 10.6.8
I've downloaded the 12.0.4 32-bit Intel ubuntu.iso and converted it to ubuntu.img and moved to root.
The "USB for OS X" instructions say insert USB Flash media.
My flash media is FAT32.
But, if one were to use Disk Utility to Erase, what format is correct: FAT, ExFAT, Mac OS Extended (Case-sensitivity), or Mac OS Extended?
Found the drive:
/dev/disk1and unmounted OK.
sudo dd if=/ubuntu.img of=/dev/rdisk1 bs=1m
The copy goes fine, BUT at the end I get a OS X message that
The disk you inserted was not readable by this computer.
This is not in the Ubuntu instructions. So, I choose the Ignore option.
diskutil eject /dev/disk1and restart with Option held down.
No USB drive shows up to boot from. Eventually I get an "Unrecognized Disk" error. I'm not surprised because my memory is that to get a bootable drive for a Mac requires some version of the correct OS X to be on the disk.
Yet, the folks who wrote these instructions would certainly know this fact -- yet their instructions don't work.