I have just downloaded ubuntu 12.10 amd64 and when I try to boot it through a USB flash disk, it says : "Unknown keyword" and the "no default or ui configuration" thing.
I looked through syslinux.cfg and this is what it contained:
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I tried using different programs to make this USB flash bootable. I used Lili, PenDrive, LinuxLiveUSB and none of them worked. Using some of these programs, the file was called syslinux.cfg and using others it was called isolinux.cfg.
If I try to extract the iso, then I have an isolinux.cfg file.
It's a shame that a fresh download lead to this.