Ubuntu – No boot option after dual boot Windows 7 and Ubuntu 13.10

dual-bootgrub2windows 7

I have been fighting with my pc to dual boot windows 7 and Ubuntu 13.10 for the past few days. I think I finally cracked it today and I'm fairly confident that everything is where it should be. However, I have one final hurdle to leap…

After finally installing Ubuntu in its own partition I couldn't log into it. There was no option to choose between the 2 OS and instead Windows just auto logged me in. So I ran Boot Repair from Live Ubuntu. Now, I have the exact opposite problem! I can see GRUB, it asks me to choose where to log in but the only option I have is Ubuntu.

If anyone has any ideas that would be great… Here is the link that Boot repair gave me, I think the answer is in here in this Boot-Repair output but I don't understand it all.

Thanks in advance.

Ps. I'm loving Ubuntu and I absolutely adore this forum!

Best Answer

Go to the terminal, and type this in:

sudo update-grub

I had the exact same problem and it worked wonders for me.

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Ubuntu – Dual boot windows 8 ubuntu

Your problem is that your GRUB configuration includes a BIOS/legacy-style boot entry for Windows, but your system is booting in EFI mode. There are a number of ways to fix this. One is to create your own custom Windows boot entry for GRUB in /etc/grub.d/40_custom. Something like this might work:

menuentry "Windows 7" {
    insmod part_gpt
    insmod chain
    set root='(hd0,gpt7)'
    chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

After creating that entry, type sudo update-grub to transfer it to the /boot/grub/grub.cfg file. I can't guarantee that this will work, though; what works for one installation doesn't always work for another.

Another approach is to install another boot manager, such as rEFInd or gummiboot. When installed as a primary boot manager, these tools will enable you to select Windows vs. GRUB, and you'll then use GRUB to select your kernel. Alternatively, either can boot a Linux kernel (version 3.3.0 or later) directly, bypassing GRUB entirely. Doing this optimally requires some reconfiguration, though; see this page on the rEFInd documentation for details.

Ubuntu – Windows doesn’t boot after updating to 13.10

Boot windows installation disk then select the windows repair or repair your computer option before you go into the installation process.
After selecting windows repair option,it will take you to the next screen.In that screen select the command prompt option

Then run the below commands,on it.

bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd

This will overwrite the grub installed in windows partition.
Atlast boot boot-repair-disk and click on the recommended repair option.Now it works.

Best Answer

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