Ubuntu – Not showing GRUB in windows 10 dual boot

bootdual-bootgrub2uefiwindows 10

So, I decided to try installing ubuntu 16.04.1 on my Windows 10 computer, and attempting to do a dual boot. This issue seems pretty common, but for some reason I just cant get the friggin GRUB menu to show up at all; it just boots me right into windows 10.

I've turned off Fastboot, and tried to turn off secureboot but couldn't find it in my BIOS lol.

I tried booting from the live USB into ubuntu, and running

sudo grub-install

but all that did was throw up an error message.

I also tried switching between legacy and UEFI booting in the BIOS, that also didn't do anything. I remember when I installed ubuntu it asked something about UEFI, and how things might go bad if I installed it in that mode, so maybe I should go reinstall ubuntu in UEFI? Or will that actually break stuff?

So I'm a total noob and have no idea as to what I'm doing… Any help please? 😛

Edit: I've figured out that windows is in BIOS mode, not UEFI. I reinstalled ubuntu onto my drive partition, making sure that it is in non-UEFI mode, and got the same result: No GRUB. I messed around in my BIOS's boot order, but all it gave me was the option to boot from either of my two hard discs.

Edit 2: Boot-Repair log

Best Answer

Try running boot repair when you are on Ubuntu or boot into ubuntu from a LIVECD.. It fixed the issue of grub not working in my case : Follow this: https://help.ubuntu.com/community/Boot-Repair

Related Solutions

Ubuntu – GRUB UEFI windows boot fail

First, disable Secure Boot. It sounds like you may have tried this already, but that's not quite 100% clear from your question.

Second, as user207507 suggests, Boot Repair may be able to fix the problem. This isn't guaranteed, though, and in rare cases it can even render Ubuntu unbootable. (Making a backup of your EFI System Partition can provide you with a way back in case you have this problem.)

Third, you might try my rEFInd boot manager. You can try the USB flash drive or CD-R image (both available on the downloads page) without installing rEFInd to your hard disk. If you can boot both Ubuntu and Windows that way, try installing the Debian package in Ubuntu.

If these suggestions don't work, then please post back with the URL that Boot Repair generates. That will give us more detailed information about your system that will be helpful in diagnosing the problem.

Ubuntu – Dual-Boot Windows 10 and Ubuntu, GRUB 2 not booting

First, you probably can disable Secure Boot; you just haven't figured out how. For systems that shipped with Windows 8, Microsoft required that users be able to disable Secure Boot, so if it really can't be done, Acer is in violation of their contract with Microsoft. That said, the option could be completely hidden or named in a confusing way. That said, disabling Secure Boot should not be necessary -- it does work for you, or you wouldn't have been able to boot the installer. There is one exception, though....

In the bcdedit command you said you used, specifying grubx64.efi bypasses Shim, which is what Ubuntu uses to deal with Secure Boot. Thus, that particular command will work only if Secure Boot is disabled. The equivalent that should work with Secure Boot active is:

bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi

You can also try using EasyUEFI in Windows. This is a third-party GUI tool for managing EFI boot manager entries. Try moving the working ubuntu entry to the top of the priority list.

If that doesn't work, then chances are your firmware is defective. I'd say to return the computer to the store for a refund, but if you've had it for beyond the return period, you may be out of luck on that score. There is an ugly hack of a workaround, as described here (among other places). At a minimum, if you need to resort to this "solution," you should write to the manufacturer. If possible, return the computer for a refund because it's defective.

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