How do I restore a missing GRUB bootloader?

Restore the GRUB Bootloader on Manjaro

1. Chroot into your linux instalation. The easiest way is with mhwd-chroot. Install it yaourt -S mhwd-chroot.
2. Restore your GRUB. Install a new GRUB bootloader with grub-install /dev/sda.

How do you fix a broken grub?

The graphical way

1. Insert your Ubuntu CD, reboot your computer and set it to boot from CD in the BIOS and boot into a live session. You can also use a LiveUSB if you have created one in the past.
2. Install and run Boot-Repair.
3. Click “Recommended Repair”.
4. Now reboot your system. The usual GRUB boot menu should appear.

How do I reinstall GRUB bootloader?

Resolution

1. Place your SLES/SLED 10 CD 1 or DVD in the drive and boot up to the CD or DVD.
2. Enter the command “fdisk -l”.
3. Enter the command “mount /dev/sda2 /mnt”.
4. Enter the command “grub-install –root-directory=/mnt /dev/sda”.
5. Once this command completes successfully reboot your system by entering the command “reboot”.

How do I manually add OS to grub?

Manually editing the GRUB files

1. Open the /etc/grub. d/40_custom file as root with a text editor. sudo nano /etc/grub.d/40_custom.
2. Add the menuentry.
3. Save the file.
4. Update the GRUB 2 menu (the file /boot/grub/grub.cfg) with update-grub. sudo update-grub.

How do I restore GRUB bootloader after installing Windows?

To recover grub:

1. Open the live version.
2. Open the terminal and run sudo fdisk -l to see where Linux is installed.
3. Run sudo mount /dev/sdaX /mnt where x is the number you have found Linux word in.
4. Run sudo grub-install –root-directory=/mnt /dev/sda to install grub.

How do I regenerate GRUB config?

Rebuild the grub.cfg file by running the grub2-mkconfig -o command as follows:

1. On BIOS-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/grub2/grub.cfg.
2. On UEFI-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg.

How do I get my grub back after installing Windows 10?

2 Answers

1. mount your Linux installed partition to some mount point.
2. Now bind some essential live root partition directories to mounted root partition at /mnt.
3. Now, change the root to newly mounted partition directory.
4. Now, install the GRUB using grub-install command at your HDD MBR.

Is prober necessary?

Summing it up: it is a good idea to disable os-prober for linux servers; furthermore it is also conducive to the (security) philosophy of Unix, of keeping it simple and installing the less amount of services/software.

What is os-prober Ubuntu?

os-prober is a command that lists other operating systems. It is used during installation and reconfiguration to create a GRUB boot menu that shows other installed OSes as well as Ubuntu.

Is it possible to repair the GRUB bootloader?

GRUB doesn’t require repairing very often, but you might not be in love with the default look. 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.

How do I re-install a broken Grub in Ubuntu?

Ubuntu Grub Console. There are a lot of methods in Linux that can be used to re-install a broken grub, some can involve the ability to work and restore the boot loader by using the Linux command line and others are fairly simple and implies booting the hardware with a Linux live CD and using the GUI indications to repair the damaged boot loader.

How do I use GRUB repair on Windows 10?

Repair GRUB Boot Menu Once boot repair is installed, you can quickly search for it by pressing the Windows key and typing boot repair. It takes a little time to load up and when it does, select Recommended repair. Boot repair will guide you through the entire process.

Why can’t I boot Windows 10 with Grub?

Without an Ubuntu partition you cannot boot Windows with Grub. Reinstall Ubuntu on the reduced partition. This will reinstall Grub and you’ll be able to boot Windows and Ubuntu with Grub again. If you do not want to install Ubuntu again, then repair your MBR, practically removing Grub and restoring the Windows bootloader.