How to create a multiboot flash drive with GRUB?

Question

GRUB

I can’t create a multiboot USB flash drive, I act according to the article: habrahabr.ru/post/99159 , but with a small gag. It is necessary that each axis / utility be in its own folder, so that there is order.
Flash drive on 32gb in NTFS, it was possible to boot into GRUB. To begin with, I try to run Ubuntu live cd, I write lines from txt.cfg to menu.lst

color blue/green yellow/red white/magenta white/magenta
timeout 30
default /default
title Ubuntu Live
kernel /ubuntu/casper/vmlinuz.efi
append file=/ubuntu/cdrom/preseed/ubuntu.seed boot=casper initrd=/ubuntu /casper/initrd.lz quiet splash --
title reboot
reboot
title halt
halt

The system starts to boot, but I catch an error:
Kernel Panic - Not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
What could be the problem?

Answer 1

In the end, we managed to win. So:
to boot from an image

title Ubuntu 12.04.3 LTS x64 live
kernel /ubuntu64/vmlinuz.efi iso-scan/filename=/ubuntu64/ubuntu-12.04.3-desktop-amd64.iso boot=casper initrd=/casper/initrd.lz quiet splash --
initrd /ubuntu64/initrd.lz

to download from a folder

title UBUNTU
kernel /ubuntu/casper/vmlinuz.efi live-media-path=/ubuntu/casper/ boot=casper initrd=/casper/initrd.lz quiet splash ignore_uuid --
initrd /ubuntu/casper/initrd.lz

Answer 2

It's easy and simple to create a bootable USB flash drive as written here wpilot.blogspot.ru/2018/02/multibootusb-in-linux.html