Two problems: I can't boot my Ubuntu Line DVD and getting GRUB error

Question

Problem:

I can't boot my Live Ubuntu DVD on my laptop.

I'm trying to install another bootable Ubuntu (16.04.2) partition on my laptop, however I can't boot from my Live DVD. My BIO is set to boot from DVD first. The Live DVD works well on other computers so it's not my DVD.

The GRUB boot menu does allow me to boot the other two OS on the hard drive.

I also get the following error at boot:

Failed to open \EFI\BOOT\grubx64.efi 80000000000
Failed to load grup
Failed to open \EFI\Microsoft\Boot\grubx64.efi 80000000000
Failed to load grup
Failed to open \EFI\BOOT\grubx64.efi 80000000000
Secure boot not enabled

I'm not sure how to mount \EFI to verify or repair the problem files.

I tried doing a grub repair, below is the output of the repair: http://paste.ubuntu.com/25126731/

So I think GRUB is preventing me from booting the LIVE DVD.

Note: I just upgraded this disk from a 500gig to a 1 terabyte disk via some sector to sector copy program. So this may have caused the problem.

Answer 1

It's unclear from your description whether you're booting from the DVD drive or from GRUB on your hard disk. The latter is unlikely to do you any good.

Most computers provide a built-in boot manager that enables you to select a specific boot program or device on a one-time basis. How you access this tool varies from one computer to another, but it's typically via a function key (usually F8 or above), Del, or Enter, pressed early in the boot process. Try using that. If you see two entries for the DVD drive, pick the one that includes "UEFI" in its name.

Note also that just because a disc boots in one computer does not mean it will work in another. There are computer-to-computer differences in optical drives, so a disc that's readable on one computer may not be readable in another. Also, Ubuntu's installation disc images are intended to be booted in both BIOS mode and in EFI mode. You may have booted in one mode, but the target computer might be trying to boot in the other mode; or the target computer might have a problem with the disc image (it uses a Frankenstein's Monster sort of format that usually works, but that some computers find objectionable).

For all these reasons, you might want to try transferring the disc image to a USB flash drive and booting in that way. I recommend either using dd to copy the image to the USB drive as a whole or using Rufus in Windows to do the job. If you use Rufus, be sure to select an option to make an EFI-compatible disk.

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EDIT:

Try this:

1. Create a USB stick using Rufus.
2. Using whatever computer and OS you can, access the Rufus-created USB stick. It should have a directory called EFI/BOOT. (That name may vary in case.)
3. Rename EFI/BOOT/bootx64.efi to something else (or delete it entirely).
4. Rename EFI/BOOT/grubx64.efi to EFI/BOOT/bootx64.efi.
5. Try again.

This procedure is based on the observation that the "Failed to open..." messages look like they're produced by Shim, which is Ubuntu's way of dealing with Secure Boot. On a bootable installation medium, Shim is stored as EFI/BOOT/bootx64.efi and launches EFI/BOOT/grubx64.efi; however, this doesn't seem to be working for you. Since your errors also note that Secure Boot is not enabled, though, Shim isn't really necessary, so you should be able to boot by renaming GRUB to use the fallback filename (EFI/BOOT/bootx64.efi), which is what's used to boot external media.