Dual-booting Ubuntu and Windows 8 with Secure Boot

http://seravo.fi/2013/dual-booting-ubuntu-12-04-windows-8-machines-restricted-boot

In Widnows 8, widnows Key + I
press power Button
Hold down shift key with reboot

Troubleshooting -> Advanced -> Bios

In the BIOS settings, find the option “Secure Boot” and disable it.

Boot to Ubuntu Live CD

$ sudo nano /etc/defaulf/grub
DISABLE_OS_PROBE=”true”

$ sudo nano /etc/grub.d/40_custom
menuentry "Windows 8" {
 insmod part_gpt
 insmod chain
 set root='(hd0,gpt1)'
 chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

// /EFI/Microsoft/Boot/bootmgfw.efi -> /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi
// EFI System Partition (/dev/sda1 -> gpt1 ; /dev/sda2 -> gpt2)

$ sudo update-grub