How to install or update Grub after Windows installation

Question

I have a laptop running only Ubuntu, but now for some reason I needed Windows so I installed it and everything else works but Grub. How do I get my computer dual booting?

When I installed Ubuntu, I can remember that I needed to create password to Secure boot.

I tried to update Grub but the menu where you can choose Ubuntu/win doesn't appear.

Are both UEFI or both (old) BIOS/CSM/legacy? Can you boot either one from UEFI/BIOS boot menu? Did you run sudo update-grub ? Is Windows fast startup or hibernation off? Otherwise grub's os-prober cannot see the Windows install. If new Windows is bitlocker off? — oldfred, Aug 28 '23 at 18:35
Does this help? How can I repair grub? (How to get Ubuntu back after installing Windows?) — mpboden, Aug 28 '23 at 18:36
Yes, I found the solution. Thanks. Sometimes you are so lost that you don't even know what keywords to use while searching. — Lauri, Aug 29 '23 at 14:36

score 0 · Answer 1 · answered Aug 28 '23 at 18:39

0

1- Disable fast startup in windows

2- After installing Windows, go to your motherboard firmware and put Ubuntu first and save the settings.

3-

sudo os-prober
sudo update-grub

Note: My English is very bad. :)

answered Aug 28 '23 at 18:39

UnitedKingdom

39

How to install or update Grub after Windows installation

1 Answers1