[Bug 2141060] Re: 25.10 doesn't support booting ubuntu isos

[Ed P]

To be clear, I have no problem booting Windows and other ISO files with
grub2.  I've been creating  grub2 menus for years. The problem reported
only occurs with the 25.10 ISO boot.

menuentry ' Windows ' {
     search -f   /EFI/Windows/bootx64.efi --set=root
     chainloader /EFI/Windows/bootx64.efi
}

menuentry " Porteus 5.01 ISO - AF'"  --class slackware   --class user-
icon-porteus  {

     set bootparms="volume=33 reboot=cold extramod=$linux_folder/Modules \
       noload=kde;jinn;lxqt;xfce;lxde;mate;open;dat.xzm;menu2" 

     search -f $iso --set=root
     loopback loop $iso
     linux (loop)/boot/syslinux/vmlinuz from=$iso $bootparms
     initrd (loop)/boot/syslinux/initrd.xz
     }

menuentry " Porteus 5.1 alpha3 ISO - AF"  --class slackware   --class
user-icon-porteus  {

     set linux_folder=/porteus5.1
     set iso="/ISOs/Porteus/Porteus-CINNAMON-v5.1-alpha-x86_64.iso"
     set iso="/ISOs/Porteus/Porteus-CINNAMON-v5.1-alpha2-x86_64.iso"
     set iso="/ISOs/Porteus/Porteus-CINNAMON-v5.1-alpha3-x86_64.iso"  
#     set iso="/ISOs/Porteus/Porteus-CINNAMON-v5.1-alpha3-251011.iso" 
#     set iso="/ISOs/Porteus/Porteus-OPENBOX-v5.1-alpha3-x86_64.iso"  
     
     set bootparms="volume=33 reboot=cold noload=-test;myc;My;50save;Dell \ 
         extramod=$linux_folder/Modules " 

     search -f $iso --set=root
     if [ "$root" == "hdX0,gpt4" ]; then
        set bootparms="volume=33 reboot=cold noload=-test;myc;My;save;Dell /
            extramod=$linux_folder/Modules "  
     fi
     loopback loop $iso
     linux (loop)/boot/syslinux/vmlinuz from=$iso $bootparms # debug
     initrd (loop)/boot/syslinux/initrd.xz
     }

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https://bugs.launchpad.net/bugs/2141060

Title:
  25.10 doesn't support booting ubuntu isos

Status in grub2 package in Ubuntu:
  New

Bug description:
  UEFI system, 16GB RAM Windows 11 system  Acer Aspire 5 notebook

  25.10 grub2 system supports booting many iso files on my system, but
  not these:

  menuentry " Ubuntu ISO 25.10"  --class ubuntu --class icon-ubuntu {

       set iso=/ISOs/ubuntu-25.10-desktop-amd64.iso
       set bootparms=`boot=casper iso-scan/filename=$root/$iso quiet splash `

  #    To save changes add "persistance" to the boot parms and create a file 
  #      named casper-rw with an ext3 file system. 
  #      https://www.pendrivelinux.com/how-to-create-a-larger-casper-rw-loop-file/ 

       search -f $iso --set=root  
       echo root=$root
       ls ($root)
       ls ($root)/ISOs/ubuntu*
       loopback loop $iso
       linux (loop)/casper/vmlinuz $bootparms
       initrd (loop)/casper/initrd 
       }

  menuentry " Ubuntu ISO 21.04"  --class ubuntu --class icon-ubuntu {

       set iso=/ISOs/ubuntu-mate-21.04-desktop-amd64.iso
       set bootparms='boot=casper iso-scan/filename=$iso splash -- '

  #    To save changes add "persistance" to the boot parms and create a file 
  #      named casper-rw with an ext3 file system. 
  #      https://www.pendrivelinux.com/how-to-create-a-larger-casper-rw-loop-file/ 

       search -f $iso --set=root
       loopback loop $iso
       linux (loop)/casper/vmlinuz $bootparms
       initrd (loop)/casper/initrd
       }

  menuentry " Ubuntu ISO 18.04"  --class ubuntu --class icon-ubuntu {

       set iso='/ISOs/ubuntu-18.04.1-desktop-amd64.iso'
       set bootparms='boot=casper iso-scan/filename='$iso' splash -- '

  #    To save changes add "persistance" to the boot parms and create a file 
  #      named casper-rw with an ext3 file system. 
  #      https://www.pendrivelinux.com/how-to-create-a-larger-casper-rw-loop-file/ 

       search -f $iso --set=root
       loopback loop $iso
       linux (loop)/casper/vmlinuz $bootparms
       initrd (loop)/casper/initrd.lz
       }

  
  The boot window error is:

  error: no such device: /ISOs/ubuntu.....

  With Grub2Win I have booted the 2 lower menus in the past.

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