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From: Quartz <quartz@sneakertech.com>
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Subject: Re: Create Ultimate Boot CD USB Stick
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 <20150907223703.692b68cd@jive.levalinux.org>
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> dd if=/path/to/iso/file.iso of=/path/to/the/device

That doesn't work for UBCD because it's a normal cd-only ISO. Only 
"hybrid" ISOs that specifically have MBR/GPT stuff can be dumped onto a 
disk and actually boot. Part of the confusion here is because a lot of 
modern Linux distros (especially Debian based distros) have started 
using "hybrid" ISOs instead of providing separate usb stick images.


In order to make a bootable usb stick from UBCD, you need to either 
hand-format the stick and set up your own boot loader, or use the 
scripts they provide.