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I installed Ubuntu 12.10 on a Dell laptop with OEM Windows 8 on it.

At first, my Grub menu didn't show at all, so I changed the /etc/default/grub file commenting the line GRUB_HIDDEN_TIMEOUT=0. After that, my Grub menu appeared, but it showed only the Ubuntu entries (no trace of Windows 8 entries).

So I booted Ubuntu from LiveCD and followed this guide: Ubuntu Boot-Repair. At the end a window appeared telling me this:

Please do not forget to make your BIOS boot on sda1/EFI/ubuntu/grubx64.efi file!

Which is something I didn't get how to manage. I went beyond this problem pretending indifference.

Now I have my Grub menu working and I can boot Windows 8, but I'm wondering what are the different entries that I have in the menu. Here they are:

  • Ubuntu
  • Advanced options for Ubuntu
  • Windows UEFI bkpbootmgfw.efi
  • Windows boot UEFI loader
  • EFI/Dell/Boot/bootmgfw.efi
  • EFI/Dell/Boot/bootx64.efi
  • System Setup

I don't know what these different entries mean, and I'd like to know if I can remove any of them from the GRUB menu. So I rephrase my questions:

  1. How was I supposed to make my BIOS boot on sda1/EFI/ubuntu/grubx64.efi file?
  2. What do all these entries mean? What are their differences?
  3. Can I remove any of them? If so, how?

Thank you in advance.

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1 Answer

  1. You use the efibootmgr command in Linux, the bcfg command in an EFI version 2 shell, the bless command in OS X (inapplicable on your Dell), or EFI-specific user interface features in some EFIs to set the default boot program. Type man efibootmgr to learn about the first of these.
  2. Try the entries and see what each one does. Unfortunately, tools like Boot Repair tend to create duplicate entries, and some manufacturers create redundant or manufacturer-specific boot entries, so it's impossible to say what each of those entries really does except by testing them.
  3. Tools like GRUB Customizer can help you edit your GRUB menus. I know very little about this tool, though, since I've abandoned GRUB.
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