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

[Cubic PPA]

Benoit THIBAUD's suggestion didn't quite work for me.
(See comment 34, https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1851311/comments/34).

However, the boot process did seem to progress a bit further: I was able
to see scrolling boot messages printed to the terminal. Previously, I
never saw any messages, just a black screen, with the computer
completely frozen.

Unfortunately, the boot process eventually ended with the following
"BusyBox" error.

    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      .
      .
      .
    BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu4) built-in shell(ash)
    Enter 'help' for a list of built-in commands.

    (initramfs) Begin: Running /scripts/casper-premount... done.
    Begin: ...waiting for devs... ... done.
    touch: /dev/.initramfs/lupin-waited-for-devs: No such file of directory
    stdin: Invalid argument
    done.
    loop: cant get info on device /dev/loop1: No such device or address
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Although, I couldn't get my computer to boot an ISO located on my disk
drive using the file from grub-efi-amd64-bin_2.02, perhaps there is an
issue in grubx64.efi, since the boot process did progress further this
time.

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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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