confirming this 'bug' - the problem is that the installer calls 'grub-
pc' (which is for 32bit 'bios' scheme, and installs it if its missing)
even after selecting the correct options during installation. it should
be calling grub-mkconfig but does not, and the system is left in an un-
bootable state on first boot or anytime after updating the kernel where
update-grub would be called.
system config:
toshiba satellite booting in EFI mode
Samsung EVO SE-SSD
Ubuntu 15 (64bit)
btrfs root volume
here are some commands to work-around the problem, try running this after
updating linux kernel.
---------------
## procedure to add efiboot on btrfs subvolume with grub
## configurable
chroot=/mnt
bootdisk=/dev/sda
rootpartition=3
efipartition=1
echo "##> updating efi grub"
echo "##> chroot=${chroot}"
echo "##> bootdisk=${bootdisk}"
echo "##> rootpartition=${bootdisk}/${rootpartition}"
echo "##> efipartition=${bootdisk}/${efipartition}"
##
## ROOT : btrfs
mount -o subvol=@ ${bootdisk}/${rootpartition} ${chroot}
## add some logic here to use ext4
## EFI : ext2
mount ${bootdisk}/${efipartition} ${chroot}/boot/efi
apt-get install efibootmgr
efibootmgr -c -d ${bootdisk} -p 1 -w -L ubuntu
apt-get install grub-efi grub-efi-amd64
grub-install --root-directory=${chroot} --boot-directory=${chroot}/boot
--bootloader-id=ubuntu --target=x86_64-efi --efi-
directory=${chroot}/boot/efi --recheck --debug ${bootdisk}
##
echo "##> entering chroot"
chroot $chroot
for i in dev dev/pts sys proc run; do sudo mount --bind /$i
${chroot}/$i; done
mkdir /boot/efi/EFI/GRUB
grub-mkconfig -o /boot/efi/EFI/GRUB/grub.cfg
##
echo "##> exit this shell to exit the chroot"
#
exit
-----------
these commands were assembled from numerous sources and the code has
not been tested extensively, since the system affected is actually
working now.
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https://bugs.launchpad.net/bugs/1466047
Title:
Install in UEFI mode installs grub-pc
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