Can't make bootable USB for release 12.04.1

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http://askubuntu.com – I'm trying to make a bootable USB drive for Ubuntu 12.04.1. The USB drive created by unetbootin doesn't boot; it results in a "Disk I/O error" message. In trying to create a bootable USB drive, PenDriveLinux installer reports a syntax error in syslinux and then says that the drive will not be bootable. And it isn't. It produces the same "Disk I/O error" message. Is there some way around this or a fix for it? (HowTos)