I found a temporary solution.
Add a custom entry to GRUB bootmenu
Append the code below to /etc/grub.d/40_custom
.
menuentry "Windows 8" {
insmod part_gpt
insmod chain
set root='(hd0,gpt1)'
chainloader /EFI/microsoft/BOOT/bootmgfw.efi
}
You can use Ctrl+Alt+T to open a terminal and run sudo nano /etc/grub.d/40_custom
, then copy and paste the code. Finally then press Ctrl+O to save and Ctrl+X to leave.
Heads up: hd0,gpt1
here is the ID of my EFI System Partition (ESP). If your ESP is not the first partition on your first harddrive during boot, then yours is different! E.g. hd1,gpt2
for the second partition on the second drive.
Replace part_gpt
with part_msdos
if the drive uses MBR and legacy partitioning and also change hd0,gpt1
to hd0,msdos1
respectively.
Apply changes to GRUB
Simply run the following command, which should generate a new GRUB configuration, including the new custom entry:
sudo update-grub
Now reboot, you should be able to boot Windows 8 now. If not, and Windows complains about corrupted BCD configuration, then continue on superuser: How can I repair the Windows 8 EFI Bootloader?
Warning: On some occasions, if you boot Windows 8, GRUB will be replaced by Windows Boot Manager as default boot manager.
Best Answer
parted
's) way of identifying an ESP./boot/efi
. This would be most important for GRUB package updates, but some other tools might need this, too./dev/sda
doesn't really make sense. That said, some user interfaces may refer to doing so because they haven't been properly updated for the EFI case. (I'm not sure what Ubuntu 12.10's state is on this score, offhand.)