When I tried to run the VMWare ESXi installer from a USB stick (after creating the installer on a USB from the ISO), I got the following error:
SYSLINUX 3.85 2010-02-20 CBIOS Copyright (c) 1994-2010 H. Peter Anvin et al No DEFAULT or UI configuration directive found! boot:
The solution was pretty simple thanks to this post. I just needed to rename a couple files on the USB as follows:
- isolinux.bin to syslinux.bin
- isolinux.cfg to syslinux.cfg
It worked flawless. But if that does not work for you, you may try formatting the USB as FAT instead of FAT32.