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  • Yes, in UEFI mode it's hard to say where the "efi" file comes from, so most probably "System Resue CD" uses GRUB 2 as main boot loader in UEFI mode without using Syslinux/ISOLINUX at all. Commented May 24, 2016 at 17:06
  • You can see how I create the ISO image file here. Note that this is the original source code, without the UEFI stuff. I'm using only the stuff which comes from Syslinux, nothing more. Also, according to the Syslinux specs the structure is valid - you can use the root folder as main configuration folder. I already tried to rename the configuration file and use syslinux instead of isolinux. I even tried to place the conf files in syslinux folder inside the efi folder (read it somewhere), still no success. Commented May 24, 2016 at 17:14
  • It looks like Ubuntu on EFI also used GRUB, at least in some versions help.ubuntu.com/… Can you confirm that successfully booting CD(s) in Virtualbox are booting the EFI version of syslinux?
    – sourcejedi
    Commented May 24, 2016 at 18:39
  • Nope, seems like Linux Mint, Ubuntu and Arch Linux, as well as System Rescue CD are all running UEFI versions of GRUB 2. The closest thing I found is using Syslinux on EFI partition for HDD installation but this is quite different from my case since I have ISO image with live Linux OS. Anyway, I tried this approach and the result I get is the same critical error. Commented May 24, 2016 at 19:18