Dtyjlui

I follow Grub2 ISO boot guide

https://help.ubuntu.com/community/Grub2/ISOBoot

here is my menu for iso booting

menuentry "Ubuntu 14.04 Live" {

     set isofile="/lilw/os/ubuntu.iso"

     loopback loop (hd0,10)$isofile

     linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=$isofile noprompt noeject

     initrd (loop)/casper/initrd.lz

}

but I failed to boot from iso file, it always make my system reboot.No message giving out so I don't know what happen.

If I get into grub menu and then using command at

grub >

typing these follow command:

grub > loopback loop (hd0,10)/lilw/os/ubuntu.iso

grub > linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=$isofile noprompt noeject

grub > initrd (loop)/casper/initrd.lz

and then

grub > boot

it will boot to the iso normally.

I don't want to boot this way. But the menuentry in grub does not work.

FYI: I have multiple version of ubuntu running on my system, range from 10.04 to the latest. My iso file store in sda10 which is a /home for the current ubuntu grub.

Edit 1: I extract the contains of iso file but still can't boot with ubuntu. But I can boot with Fedora 20 when extract it contains to a folder, weird..

Edit 2: Finally I find a site that help out with new grub2 command syntax. all the failed boot is because of wrong syntax in grub2

TRY THIS: solved my problems

http://git.marmotte.net/git/glim/tree/grub2

So my grub menu entry will look like this:

menuentry "Ubuntu 14.04 (LTS) Live Desktop amd64" --class ubuntu {

   set isoname="ubuntu-14.04-desktop-amd64.iso"

   set isofile="/lilw/os/${isoname}"

   loopback loop (hd0,10)$isofile

   linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=${isofile} quiet splash

   initrd (loop)/casper/initrd.lz

}

if I missing the two '{ }' of isofile it won't boot. so weird

In many versions of ubuntu iso as in Ubuntu 18.10 (Cosmic Cuttlefish), the files initrd.lz are just initrd . I suggest you to go and inspect your iso file for initrd and vmlinuz files.

While booting Ubuntu 18.10, I had also made that mistake.

Try this

 menuentry "Ubuntu 14.04 Live" {

 loopback loop (hd0,10)/lilw/os/ubuntu.iso

 linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/lilw/os/ubuntu.iso noprompt noeject

 initrd (loop)/casper/initrd.lz

 }

• Place your ISO file to /live:

sudo mkdir /live

sudo cp somelinux.iso /live

• Add new menu entry to the grub.cfg
  

sudo gedit /etc/grub.d/40_custom

menuentry 'ISO Ubuntu 14.04 2014 Live' --class os --class gnu-linux --class gnu --class os --group group_main {

                set isofile="/live/ubuntu-14.04-desktop-amd64.iso"



         insmod ext2

         insmod loopback

         insmod iso9660      

                loopback loop (hd0,msdos5)$isofile      



                linux (loop)/casper/vmlinuz.efi  file=(loop)/cdrom/preseed/ubuntu.seed noprompt boot=casper persistent iso-scan/filename=/$isofile quiet splash --

                initrd (loop)/casper/initrd.lz





}

TO DO:

1. change in the menu entry above the code name for your partition, holding /live/somelinux.iso, in my case it's hd0,msdos5 because it is on /dev/sda5/



2. 
   

   change the file name from somelinux.iso to yours, in my case I have: ubuntu-14.04-desktop-amd64.iso

   
   
   
   
   
   • update GRUB
   
   
   
   

sudo update-grub

• reboot

I figured out the problem is the syntax of grub2 changed. follow this link and find your grub entry to boot, there is still some lines you will need to fill in to work.

http://git.marmotte.net/git/glim/tree/grub2