[Bug 1851311] Re: loopback command hangs in 2.04 under UEFI

[C.S.Cameron]

I notice that with BIOS mode booting, that if rmmod tpm is put in the
body of the menuentry, then there is the message "error: no such
module", and  "Press any key to continue..."

If it is put anywhere above fi the computer boots without an error
message.

If it is put anywhere above the menuentry and below fi, we get scrolling
"{FAILED} Failed to start Login Service...", etc. (but I have not tried
indenting in these locations.

Booting in UEFI mode it seems that anywhere that "rmmod tpm" works in
BIOS mode, works for UEFI also.

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

Title:
  loopback command hangs in 2.04 under UEFI

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2 package in Debian:
  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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