I've used Ubuntu live and the start up disk creator tool to create a bootable usb with ubuntu.
I used the start up disk tool and I first clicked erase, to clear the contents of the usb, and then create disk. It completed successfully, but I cannot get my mac to recognize it as a bootable device. It does not show up in the startup disk list (in system preferences). I cannot get it see the device using 'option' or 'c' while rebooting.
How do I get mac to see it as a bootable device?