GRUB is what makes dual booting a PC with Windows and a Linux distribution such as Ubuntu possible.
Edit Boot Menu Install Two OperatingYou can always install two operating systems on a disk but youll only be able to boot one unless the bootloader allows you to choose.If anything goes wrong, you can easily fix, edit and repair the GRUB boot menu using commands.If youre using a dual boot setup, youre most probably making use of GRUB whether youre aware or not. Sometimes, when you install Windows after installing Linux, or as it is my case, Ubuntu, it breaks GRUB. GRUB is still there but the Windows bootloader takes preference over it, thus booting right into Windows. Theres a graphical way, which is easier and you will know what youre doing. Theres a command-line way which we will try to avoid here for two reasons. Its difficult, in the sense that it will require a lot more explanation without which you wont know exactly what you did to your system. The graphical way is also harmless, meaning you can do it wrong and your data will still be very safe, waiting for you to try again and do it right. The only con is that it requires that you have a bootable Ubuntu disk or USB and a working internet connection. Edit Boot Menu Free And ItsThis isnt a big deal since Ubuntu is available for free and its easy to create a bootable Ubuntu drive. ![]() This allows you to use a Live Ubuntu session directly from your USB drive without having to install anything. This step is not required if you can boot into Ubuntu installed on your PC. In the Terminal window, use the following commands one by one to install Boot repair. You will be required to push commands through the Terminal and make the necessary choices. Boot repair takes care of most of the other things that you would otherwise have to manually do via more complex commands. It also lets you copy the commands so you can simply paste them into the terminal and execute them easily. You can quite easily change how the GRUB bootloader menu looks to something more pleasing to the eye. You can also change the boot order, so it would boot into your OS of choice by default unless you choose otherwise at the time of boot. To install it, just execute the following commands in a Terminal window. ![]() It lets you manually select the background image or color, font, and highlight color as well as the font size.
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