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I've tried a few times and have always been unsuccessful. I followed the instructions from quite a few tutorials, and I have been able to get Linux and Windows installed but Grub doesn't detect Windows and just boots into Ubuntu.

The partitions I want to get running are:

SSD 1: Windows (127GB)
SSD 2: EFI Boot (500MB)

HDD 1: Ubuntu Root (56 GB)
HDD 2: Ubuntu Swap (8 GB)
HDD 3: Storage (~ 950 GB)

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  • Please be more specific about what happens at boot, i.e. after you pressed the power button.
    – Kalle Richter
    Apr 12, 2016 at 11:49

3 Answers 3

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You Should update your Grub loader to see Windows 10 in your Grub Loader Entry. Initially, boot to Ubuntu by normally or Live USB or DVD. Connect your HDD which contains Windows 10. Open Terminal and Run the command

sudo update-grub

Now you can see the list of bootable partitions. like Windows 10(loader). Your Grub is updated restart your computer and now you can see list OSs you can boot into!

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  • Ah okay, I'll try that. I have Windows installed on SSD though.
    – Nami
    Apr 10, 2016 at 10:15
  • so what? it doesn't cause any problem. just update your grub :)
    – Sathish Kumar
    Apr 10, 2016 at 11:32
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It looks like Windows was installed with EFI on GPT partition table, but Ubuntu was installed with legacy MBR partition table and GRUB will not play well in this setup. Reinstall Ubuntu making sure that you boot the USB drive or DVD in UEFI mode and Ubuntu will install with an EFI partition. Then GRUB should automatically detect Windows and give you an option at boot.

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  • If not in same boot mode both UEFI or both BIOS, grub cannot boot system in different boot mode. You want to partition all drives with gpt, And Ubuntu/grub only installs to ESP- efi system partition on sda. I normally add an ESP even if not used to all gpt drives. And copy boot files to each drive for system on that drive. askubuntu.com/questions/743095/… and: askubuntu.com/questions/591193/…
    – oldfred
    Apr 10, 2016 at 13:53
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Try boot-repair. It's a utility tool that will allow you to configure grub and (I'm not sure but I think it also allows you to) select partitions on different hard disks with OS to be added to the grub menu. Google grub repair. I'm pretty sure it'll be helpful.

Choose the standard configuration and it will detect os's . This is the easiest way, but you will get extra entries on your grub menu.

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  • this is a question, not an answer.
    – tlund
    Apr 10, 2016 at 10:02
  • Hmm, I can't seem to find grub repair. I have tried Boot repair though and it didn't really do anything.
    – Nami
    Apr 10, 2016 at 10:18

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