[Bug 1851311] [NEW] Grub 2.04 Out of memory error, No server error

[oldfred]

Public bug reported:

Trying to loop mount ISO.

Installed grub 2.04 to flash drive in UEFI mode from 19.10
Flash drive does not boot and gives Out of memory error & no server error. Must load kernel first.

Re-installed grub from 18.04 to same flash drive using same boot stanza.
Booted without issue.

>From 18.04
fred at Bionic-Z170N:~$ grub-install -V
grub-install (GRUB) 2.02-2ubuntu8.13

from 19.10
fred at fred-Z170N-eoan:~$ grub-install -V
grub-install (GRUB) 2.04-1ubuntu12

Boot stanza that works in 2.02 but not in 2.04

menuentry "Focal Live ISO" {
set isofile="/ISO/focal-desktop-amd64.iso"
loopback loop (hd0,1)$isofile
    linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile toram noeject
    initrd (loop)/casper/initrd
}

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1851311

Title:
  Grub 2.04 Out of memory error, No server error

Status in grub2 package in Ubuntu:
  New

Bug description:
  Trying to loop mount ISO.

  Installed grub 2.04 to flash drive in UEFI mode from 19.10
  Flash drive does not boot and gives Out of memory error & no server error. Must load kernel first.

  Re-installed grub from 18.04 to same flash drive using same boot stanza.
  Booted without issue.

  From 18.04
  fred at Bionic-Z170N:~$ grub-install -V
  grub-install (GRUB) 2.02-2ubuntu8.13

  from 19.10
  fred at fred-Z170N-eoan:~$ grub-install -V
  grub-install (GRUB) 2.04-1ubuntu12

  Boot stanza that works in 2.02 but not in 2.04

  menuentry "Focal Live ISO" {
  set isofile="/ISO/focal-desktop-amd64.iso"
  loopback loop (hd0,1)$isofile
      linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile toram noeject
      initrd (loop)/casper/initrd
  }

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