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I am using VAIO T series with Win 8 preinstalled, I have installed Ubuntu 12.04.3 on a different partition and set GRUB at default. But whenever I choose to boot Win 8, the next time I start the laptop, it Windows Boot Manager which shows up at default. How can I set GRUB default constantly?

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marked as duplicate by Rod Smith, Luis Alvarado Sep 25 '13 at 3:56

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I can make no promises, but try this from a Windows Command Prompt window launched with Administrator privileges:

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

Note that {bootmgr} should be typed exactly; that's not a variable. If that doesn't work, you could try this in Linux:

  1. Back up the entire contents of /boot/efi (your EFI System Partition, or ESP).
  2. Type sudo mv /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi /boot/efi/EFI/Microsoft.
  3. Type cp /boot/efi/EFI/ubuntu/grubx64.efi /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi.
  4. Create a new /etc/grub.d/40_custom file entry that refers to EFI/Microsoft/bootmgfw.efi. Model it after the existing entry in /boot/grub/grub.cfg that refers to EFI/Microsoft/Boot/bootmgfw.efi; just remove Boot from the boot path and give it a new name.
  5. Type sudo update-grub to install the new GRUB entry.

When you reboot, GRUB should come up. The trouble is that if/when Windows decides to re-install its boot loader, the system will start booting straight to Windows again.

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Please do not just copy and paste answers without citing the source of the answer - askubuntu.com/questions/235567/… –  fossfreedom Sep 24 '13 at 22:10

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