Originally Posted by
Skepticist
It should be booting via GRUB to start up isolinux but the lack of an EFI folder might be what's stalling things.
I have a mint 18.3 32bit iso from and it works fine (1.9GB)
Major correction::
I opened that ISO with G-Mount and indeed there is no 'EFI' partition so it must have to be created by by the tool used to write the ISO to a disc or flash drive. I use RUFUS in Windows for writing to flash drives and Nero for writing to DVD, both work without a problem for me at least.
More in-depth information about the GRUB boot process -
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