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

[Benoit THIBAUD]

The problem doesn't come from the casper package. The problem is in the
grub-efi-amd64-bin package (latest version tested:2.04-1ubuntu16).
Actually, it's the file grubx64.efi inside this package
(/usr/lib/grub/x86_64-efi/monolithic/grubx64.efi).

menuentry "..    Xubuntu .... test daily" {
	set isofile="/isos/focal-desktop-amd64.iso"
	search --set=root --file $isofile
	loopback loop $isofile
	linux (loop)/casper/vmlinuz iso-scan/filename=$isofile boot=casper noprompt quiet splash --
	initrd (loop)/casper/initrd
}

menuentry "..    Xubuntu Default cd Menu" {
	iso_path="/isos/focal-desktop-amd64.iso"
	export iso_path
	search --set=root --file $iso_path
	loopback loop $iso_path
	root=(loop)
	configfile /boot/grub/loopback.cfg
	loopback --delete loop
}

It doesn't work in 2.04 grub version. So I experienced something.

1-	I downloaded the 2.02 grub-efi-amd64-bin package from here:
	https://packages.ubuntu.com/disco-updates/amd64/grub-efi-amd64-bin/download
	
2-	I opened the deb package with my archive manager

3-	I extracted the file: grubx64.efi
	(from /usr/lib/grub/x86_64-efi/monolithic/)
	
4-	I launched efibootmgr in a terminal to be sure where to copy it
	
5-	I copied it in the right folder in /boot/efi
	sudo cp grubx64.efi /boot/efi/EFI/xubuntu/.
	
After that, both menus worked fine (in a 2.02 grub)!

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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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