Ubuntu 12.10 won't boot from usb - isolinux.bin missing or corrupt

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http://askubuntu.com – This was an official 64-bit download from the Ubuntu site, so it's kind of sad to see even that's not working. I made a bootable Ubuntu 12.10 USB stick with USB Image Writer (mintstick) on Linux Mint 14 Cinnamon and then shut down after ejecting the drive. When I put the drive back in and boot from it, a message shows briefly: 'isolinux.bin missing or corrupt,' before going black and booting to Mint. I have tried Unetbootin instead of Mint's USB Image Writer but the USB drive does not show. Unetbootin has not worked for me in the past anyway whenever creating live USBs. USB is formatted t (HowTos)