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I have a laptop, and I'm going to install Ubuntu (I have experience, and I have successfully installed Arch Linux, Ubuntu, Fedora, Debian, Xubuntu, Kubuntu, Manjaro Linux, etc.), but installing Ubuntu 14.10 (Utopic Unicorn) alongside Windows 10, Ubuntu can't detect Windows.

It shows me like there's no OS, but I have Windows 10.

I have two primary partitions by the way if I manually install. If the Ubuntu installer can't detect Windows 10, will it be detected at GRUB?

Fabby
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user284299
  • 111

6 Answers6

12

I wasn't able to get the boot repair to work so I manually added a Windows 10 boot option.

The first step is to edit /etc/grub.d/40_custom (using SUDO) and add the following lines to the bottom of the file:

menuentry 'Windows 10' {
set root='(hd0,msdos1)'
chainloader +1
}

In this case my bootloader was in /dev/sda1 hence the 1 at the end of msdos. After this run sudo update-grub2 and you should be good to go.

Worked for me, advice taken from here: http://technologytales.com/2010/11/21/manually-adding-an-entry-for-windows-7-to-an-ubuntu-grub2-menu/

DaneM
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Zack
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3

Windows should be detected while you manually install Ubuntu 14.10 and added to GRUB. If it is not added initially, boot into Ubuntu, install Boot Repair and run that. That should add Windows 10 to your GRUB.

Source: I have run a Windows 10, Ubuntu 14.10, elementary OS, Fedora quad boot

larouxn
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1

I had the same problem with Windows 7 after an Ubuntu 15.04 install.

The solution was to use Grub 2 ntloader module instead of chainloader.

Here is my 42_custom in /etc/grub.d/

menuentry "Win 7 (loader) (on /dev/sda1)" --class windows --class os {
insmod part_msdos
insmod ntfs
insmod ntldr
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root 9804BD3004BD126C
ntldr ($root)/bootmgr
}

You can change the text to Windows 10, it's only text.

Sreenikethan I
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ross minet
  • 181
0

Why don't you try to run boot repair from the Windows 10 ISO image? That way, Windows will have an MBR, and it would show the other operating systems. Try that.

I believe you have installed Ubuntu, so insert the Windows DVD and select repair -> cmd.

Now enter,

Bootrec.exe /fixmbr

There are other commands too. You can try these out:

/FixBoot - writes a boot sector onto system partition to start Windows

/ScanOs - scans all disks for Windows installation and displays them.

/RebuildBCD - scans all disks for Windows installations and prompts you to pick the ones you want to add to the BCD.
Peter Mortensen
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cyberrspiritt
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0

Boot Ubuntu and mount your Windows partition (simply open the disk on Nautilus)

Run the following on the command line: CtrlAltt:

sudo os-prober

If your Windows installation was found, you can run:

sudo update-grub

Note that step 2 is just for your convenience. You could just mount the Windows 7 partition and then run update-grub.

graham
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ahmad.sh
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0

I have something like this

menuentry 'Windows 10' {
search --set=root --file /EFI/Microsoft/Boot/bootmgfw.efi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
Elhatron
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