Computer says "Reboot or select proper boot device" after attempting to dual boot Ubuntu.?

Question

So I attempted to install Linux Ubuntu alongside Windows 10. I created partitions on my hard drive and installed Ubuntu from a bootable USB stick. At the end of the installation, just before it said "Installation complete, restart to finish", it said:
"Unable to install GRUB in /dev/sdaExecuting `grub-install /dev/sda` failed.This is a fatal error."After restarting I was met with a screen that says "remove boot device and press enter" (or something like that), which was expected. However having doing this, the screen just says "Reboot or select proper boot device" and I am unable to boot neither Windows nor Ubuntu.

After doing some research it seemed as though the problem is mainly to do with GRUB not installing.

I attempted to manually install grub from the Ubuntu live USB using this:
https://askubuntu.com/questions/831216/how-can-i-reinstall-grub-to-the-efi-partition

However, the terminal displayed the error 'grub-install error failed to register the efi boot entry operation not permitted '.

I am able to access my windows files from the Ubuntu live USB, so it doesn't appear to be the case that the hard drive has been totally wiped or anything, which is good.

I have also tried changing the settings in the BIOS however, this hasn't worked.

Any help or advice would be greatly appreciated, thank you in advance.

Answer 1

Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key.

Answer 2

See the article here; the system must be in EFI mode for grub to properly install:



https://superuser.com/questions/376470/how-to-reinstall-grub2-efi

Answer 3

It might also have something to do with "secure boot" in your BIOS settings. Or, something else was corrupt in your boot partition (UEFI boot). Hard to diagnose without much more detail about your system/hardware.



Start off by recovering your Windows boot with a Win10 recovery (install) media. Then try again.

Answer 4

@keerok

Thanks for your answer.

I've tried to install GRUB from the live USB and the terminal returns an error.

When you say "go to the command line and boot your newly installed ubuntu", do you mean like boot the Ubuntu installed on my hard drive from my live USB? Is there a command I can use from the terminal to do this in the live USB?

Answer 5

Can't remember exactly how and you will have to research the exact commands to do this but I've done it a lot of times years ago when I was setting up a Linux computer lab at a school. 



Since the Live USB boots, why not use it to install grub? Boot it then instead of proceeding to install, go to the command line and try to boot your newly installed Ubuntu. If that works, reboot then go to GRUB's command line again and reinstall GRUB from there.