[ubuntu] Cannot mount ANY iso later than 11.04 under os x 10.6.8

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http://ubuntuforums.org – For clarity, my goal is to create a bootable install usb using the instructions in the guide here but following this results in a non-bootable usb which will not even mount as a drive once the computer has booted up. Furthermore every 12.x iso I have tried will not even mount using the OS X disk utility, instead showing an error message "Unable to mount the_iso_i_am_trying.iso (no mountable file systems) I think this is the root of the problem All the 11.x iso images I have tried work fine. I have tried ubuntu-11.10-desktop-i386.iso ubuntu-12.04-desktop-amd64.iso ubuntu- (Hardware)