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

[C.S.Cameron]

Oops, After a little more experimenting, it appears that it is the version of Ubuntu that mkusb uses to create the persistent drive that determines the version of grub, not the version of Ubuntu mkusb is installed in. I guess that this should have been obvious. 
I created an ISO booter foundation using mkusb installed in 18.04 using a 19.10 ISO. I added both 18.04 and 19.10 ISOs to the ISO folder on the usbdata NTFS partition. Both had problems booting in UEFI as mentioned above, they uses grub 2.04
I then created another ISO booter foundation using mkusb installed in 19.10 using a 18.04 ISO. I added both 18.04 and 19.10 ISOs to the ISO folder. Both booted fine in UEFI mode, they used grub 2.02.
I will try duplicate my findings tomorrow.

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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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