Basically unetbootin creates a syslinux.cfg which is not that much derived from the orginal isolinux.cfg which it could be. it also renames the kernel + initrd images. I prefer a different approach, but well some ppl like it some hate it... My scripts always formats the usb key, unetbootin can not format. Now to the official tool to create an U live stick: when you create a persistent stick on fat you can not create a huger FILE for persistent mode than 4gb (minus 1 byte). This also takes ages because there are not fat sparse files, i create just a 2nd partition with the max space possible in that case which is much faster. I just don't care about the data on the stick at all You find a collection of my scripts in irc.freenode.net/#kanotix with !usb (then !more). I supported even V/7 on usb key months before the official Win7 tool was out using syslinux+chain.c32. I have got even scripts for freedos on usb key, but well not linked there... If i need something i write it, i do not care at all about unetbootin or tools that require U live mode.
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Ubuntu 11.04 Released