same bug trying to create a bootable USB disk for Ubuntu 14.10 desktop 64 bits from an Ubuntu 14.10 desktop 64 bits system, with unetbootin 603-1
Copying the 3 files /usr/lib/syslinux/modules/bios/{libcom32,libutil,menu}.c32 to the root of the USB disk worked.
same bug trying to create a bootable USB disk for Ubuntu 14.10 desktop 64 bits from an Ubuntu 14.10 desktop 64 bits system, with unetbootin 603-1
Copying the 3 files /usr/lib/ syslinux/ modules/ bios/{libcom32, libutil, menu}.c32 to the root of the USB disk worked.