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

[C.S.Cameron]

On a previous post I mentioned that I put `rmmod tpm` on it's own line
in grub.cfg menuentry, above the "loopback loop $isofile" line and that
I got "error: no such module" when booting in BIOS mode.

I have discovered, (after testing the latest mkusb - unstable), that
putting `rmmod tpm` up top just above the fi line allows booting ISO's
in UEFI mode without getting the no such module error when booting in
BIOS mode.

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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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