Public bug reported:
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.
** Affects: debian-installer (Ubuntu)
Importance: Undecided
Status: New
** Tags: grub uefi
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https://bugs.launchpad.net/bugs/924591
Title:
[UEFI] GRUB 2 installation method
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