[Bug 924591] Re: [UEFI] GRUB 2 installation method

[Xiao-Long Chen]

*** This bug is a duplicate of bug 879858 ***
    https://bugs.launchpad.net/bugs/879858

This bug was marked as a duplicate of 879858, but I don't think that
they're the same bugs. The other bug is about a kernel error when using
efibootmgr while installing GRUB EFI. This bug suggests a better command
that can be run to install GRUB EFI (more of a feature enhancement).

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https://bugs.launchpad.net/bugs/924591

Title:
  [UEFI] GRUB 2 installation method

Status in “debian-installer” package in Ubuntu:
  New

Bug description:
  With more UEFI based systems now, it's pretty important that GRUB 2 is
  installed correctly on those systems.

  The way Ubuntu installs GRUB 2 on UEFI systems puts the GRUB 2
  configuration files in EFI_PARTITION/efi/ubuntu/grub.cfg. I'm not sure
  how it actually is installed, but the behavior can be replicated by
  installing GRUB 2 with:

  grub-install --boot-directory=/boot/efi/efi --bootloader-id=ubuntu
  --force --recheck

  The problem with this is that the configuration files are inconsistent
  with the BIOS version GRUB 2, making all scripts that depend on the
  /boot/grub directory structure useless.

  If GRUB 2 UEFI is installed this way:

  grub-install --bootloader-id=ubuntu --force --recheck

  GRUB 2 will continue to use /boot/grub, just like the BIOS version and
  generates a grubx64.efi file in EFI_PARTITION/efi/ubuntu/ that will
  ALWAYS load /boot/grub/grub.cfg from the /boot partition, which the
  grub-install script identifies during installation. This is exactly
  the same behavior in the BIOS version, where GRUB 2 in the MBR always
  boots from the /boot partition that was mounted during installation.

  Not only does this method make things more consistent, it can also
  shave off a little bit of the boot time, because the EFI partition
  will no longer need to be mounted every boot.

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