Fix GRUB Windows 10

Although we'll be using a Ubuntu Desktop live instance, the process will work even if you're repairing, say, Fedora or CentOS. Note that the tool we are going to use will work on any system that uses GRUB2. Either way, make sure you've created your bootable USB device before you attempt this.

I highly recommend you use the desktop version of Ubuntu - there's a very handy graphical tool that can fix the problem. For that, you can use a tool like Pop!_OS Popsicle or the always faithful Unetbootin. You'll also want to have a bootable USB device with an instance of Ubuntu Desktop ready to boot.

To that end, we'll just use a working (test) instance of Ubuntu Server for this purpose. Before you need to repair GRUB2, don't wait until you have a failed instance before you master this task. I'm going to walk you through the process of doing just that - repairing and reinstalling GRUB2 with the help of a Ubuntu Live USB device.

Because nothing can toast a sysadmin's day like having to do a full OS reinstall and data restore on a mission-critical server. It's probably going to be a very rare occasion when you need to repair or reinstall the GRUB2 bootloader on one of your data center Linux servers, but when that time comes, you will be glad for the knowledge.

Fix grub windows 10