[Bug 1897416] Re: grub 2.04 could not boot from iso at UEFI native environment

[Seiichi Nakashima]

This is not a bug, I found a grub parameter in web.
I update my NotePC from ubuntu-18.04.5 to ubuntu-20.04.1.
thank you

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https://bugs.launchpad.net/bugs/1897416

Title:
  grub 2.04 could not boot from iso at UEFI native environment

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Dear everyone

  I use ubuntu-20.04.1 at my UEFI CSM environment desktop PC.
  grub 2.04 can boot from iso file.
  and I use ubuntu-18.04.5 at my UEFI native environment note PC.
  grub 2.02 can boot from iso file.

  I check to boot from iso using ubuntu-20.04.1 liveCD usb at note PC.
  I power on note PC, and selecting boot device to use UEFI boot manager.
  then grub 2.04 boot menu displayed.

  I change Boot from next volume to iso boot.
  iso boot step as same as grub 2.02 definition.
  but grub 2.04 could not boot from iso, display black screen.
  I power off note PC.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nakasima   1542 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2020-05-29 (120 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 058f:5608 Alcor Micro Corp. 
   Bus 001 Device 003: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Jumper EZbook
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic root=UUID=86097f4a-e2d9-4432-8006-816cf4c322c3 ro ipv6.disable=1 quiet
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-48-generic N/A
   linux-backports-modules-5.4.0-48-generic  N/A
   linux-firmware                            1.173.19
  Tags:  bionic
  Uname: Linux 5.4.0-48-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/01/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: Jumper10x.P8.WP3132.NHNAUHL02
  dmi.board.asset.tag: Default string
  dmi.board.name: EZbook
  dmi.board.vendor: Jumper
  dmi.board.version: Default string
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 10
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrJumper10x.P8.WP3132.NHNAUHL02:bd02/01/2018:svnJumper:pnEZbook:pvrDefaultstring:rvnJumper:rnEZbook:rvrDefaultstring:cvnDefaultstring:ct10:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: EZbook
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Jumper

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