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I am attempting to dual boot a pc I built using ubuntu 18.04 and windows 10. I successfully installed ubuntu on one of my ssds. I began installing windows on the other ssd. During the install process the system rebooted, but booted directly into ubuntu. Since this point, I have not been able to open my bios (I just get a black screen) so I cant tell it to boot with the windows drive.

I can still boot into ubuntu by starting the pc, but why is my bios not loading, and how can I save the windows install?

Austin
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2 Answers2

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Go into Ubuntu and run the following command to recognize the foreign operating system (Windows):

sudo update-grub

Then, reboot.

You should have a Grub screen after you reboot with an option for Ubuntu and one for Windows (or Windows Bootloader). Often times, this will also have a last option to enter the BIOS or main boot menu.

If that fails to work, set a timeout for grub and change the option to use the grub menu manually.

Run the following command to edit your /etc/default/grub file options:

sudo sed -i 's/GRUB_TIMEOUT_STYLE=hidden/GRUB_TIMEOUT_STYLE=menu/;s/GRUB_TIMEOUT=0/GRUB_TIMEOUT=10/' /etc/default/grub

Then, update grub:

sudo update-grub

and reboot.

Also, as @Jon mentioned in the comments, you may need to disable fastboot in Windows as well. These changes to grub should allow you to access the BIOS and/or Windows Bootmanager.

mchid
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Just because your screen is black does not mean you are not able to get into your UEFI or BIOS. Since you didn't specify your hardware I can't tell you which key it is. On older hardware it was often the 'delete'-key. But it can be 'F2', 'F10' or 'F12'. If you edit your question with your hardware info I can search for it.

And update grub and disable fast boot in Windows as suggested by mchid and Jon.

HomerSimpson
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Joepie Es
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