How to make a Ubuntu boot usb in OSX (don't use the UNetbootin USB installer)

I had a lot of trouble making an Ubuntu boot USB drive from OSX. The instructions on¬†https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-macos#0 don’t work in general. I think there are two reasons:

  • The program doesn’t reformat the USB drive
  • If there are existing files on the USB from say a 32-bit Ubuntu and you create a 64-bit usb,¬†UNetbootin doesn’t overwrite all the necessary files. In this case the installation goes smoothly but when you reboot the installed system, you get a “No working init” error.

The best way to do it is:
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