Uploaded December 2014 | Updated September 2026, 1 week ago

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GRUB bootloader gets overrided if you install Windows after Ubuntu. I make this video tutorial on how to restore and customize the GRUB loader.

Common Problem: You install Windows after you install Ubuntu. That erases the GRUB loader, and instead of being able to switch between Ubuntu and Windows, Windows will boot automatically.

Steps:
1) Create a bootable USB Flash Drive of Ubuntu.
- Download Ubuntu
ubuntu.com/download/desktop
- Download and install Universal USB Installer
pendrivelinux.com/universal-usb-installer-easy-as-1-2-3
- Create bootable USB flash drive of Ubuntu
2) Restart computer and boot into Ubuntu.
3) Use try Ubuntu and install boot-repair.
Commands:
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair
y
boot-repair
4) Recommended repair.
5) Afterwards, if you restart, you can see the GRUB Bootloader again. You can select between Ubuntu and Windows.
6) Use Ubuntu
Next parts will be customizing Ubuntu GRUB Bootloader:
8) Open a terminal:
sudo fdisk -l
9) Keep track of what sda number is Windows partition on.
10) Customize GRUB bootloader
cd /boot/grub
sudo gedit grub.cfg
11) Delete any duplicate entries that do not match sda number correctly, and delete any extra entries that you may never use.

Twitter: twitter.com/microwavesam