I try to install ubuntu 11.04 to my macbook(running MAC OS 10.5.8 ) using usb drive. I followed the instruction on the download page and transferred the ISO to usb drive. but when I restart the mac, holding option, I can not see option of boot with usb drive. there is only one option that is boot with my hard drive.
my macbook is almost three years old, but I am sure the usb should work, since I have installed MAC OS using usb drive.
any ideas what is going on?