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

[PJSingh5000]

During bootup, I enter the grub2 command-line by pressing c on the Grub
menu.

When I type the following command...

loopback loop (hd0,gpt2)/ubuntu-19.10-desktop-amd64.iso

...grub hangs, there is no more output or activity on the terminal, and
eventually the laptop fans spin up because the laptop gets hot.

The path (hd0,gpt2)/ubuntu-19.10-desktop-amd64.iso is valid on my
system.

I am experiencing this in Ubuntu 19.10 and did not have this issue in
prior Ubuntu releases.

The version of grub2 and grub2-common I have is 2.04-1ubuntu12.

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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:
  Confirmed

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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