I bought a HP laptop equipped with Windows 8.1, but it would jump over Ubuntu’s Grub after I install it.

Since I could still use BIOS to enter into the disk boot manually and I have /boot/efi in my Ubuntu, it demonstrates that my Ubuntu 14 is fine with the EFI. So I decide to cheat the evil and stupid UEFI by replacing Microsoft’s .efi file with Grub .efi file.

1. sudo cp /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi.old
   • sudo cp /boot/efi/EFI/ubuntu/grubx64.efi /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi

   • add these codes to /etc/grub.d/40_custom, attention, should copy resource id from /boot/grub/grub.cfg

     menuentry ‘Modified Origin Windows Boot Manager (on /dev/sda2)’ –class windows –class os $menuentry_id_option ‘osprober-efi-F282-E2AF’ { insmod part_gpt insmod fat set root=’hd0,gpt2’ if [ x$feature_platform_search_hint = xy ]; then search –no-floppy –fs-uuid –set=root –hint-bios=hd0,gpt2 –hint-efi=hd0,gpt2 –hint-baremetal=ahci0,gpt2 F282-E2AF else search –no-floppy –fs-uuid –set=root F282-E2AF fi chainloader /EFI/Microsoft/Boot/bootmgfw.efi.old }

• update-grub2

Another more suitable way is to use “efibootmgr” sudo efibootmgr -o 0005,0004 to specify the order explicitly