I booted with the listed iso files and checked if it works to create a working USB boot drive with Ubuntu 16.04 amd64 LTS using the usb-creator-gtk alias the 'Startup Disk Creator'.
From a system with a Trusty kernel:
ubuntu-14.04-desktop-i386.iso: does not work, 'gfxboot.c32: not a COM32R image'
ubuntu-14.04.1-desktop-amd64.iso: does not work, 'gfxboot.c32: not a COM32R image'
From a system with a Wily kernel:
lubuntu-14.04.4-desktop-amd64.iso: does not work: 'gfxboot.c32: not a COM32R image'
Do you need more evidence, that it does not work? I think you should suggest a method that works ;-)
I booted with the listed iso files and checked if it works to create a working USB boot drive with Ubuntu 16.04 amd64 LTS using the usb-creator-gtk alias the 'Startup Disk Creator'.
From a system with a Trusty kernel:
ubuntu- 14.04-desktop- i386.iso: does not work, 'gfxboot.c32: not a COM32R image'
ubuntu- 14.04.1- desktop- amd64.iso: does not work, 'gfxboot.c32: not a COM32R image'
From a system with a Wily kernel:
lubuntu- 14.04.4- desktop- amd64.iso: does not work: 'gfxboot.c32: not a COM32R image'
Do you need more evidence, that it does not work? I think you should suggest a method that works ;-)