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Restoring the bootloader using the Live disk.
Sometimes, especially after a secondary operating systems has been installed, the master boot record gets damaged which then prevents the original Linux system from booting.
If this happens, it is necessary to reinstall *GRUB2* to recreate the original settings. The process not only discovers all installed operating systems, but usually adds them to the *GRUB2* configuration files, so they will all become bootable by *GRUB2*.
Before you start
Get the Fedora Live ISO from link:https://download.fedoraproject.org/pub/fedora/linux/releases/[getfedora.org].
Prepare a bootable device using the downloaded ISO, either a CD or a USB.
Boot the Fedora live system from the bootable device you have created.
Open the terminal.
Examine the partition layout and identify the `boot` and the `root` partition.
# fdisk -l
For Default Instalation in LVM.
Create the mount point for the root partition.
# mkdir -p /mnt/root
If you are using the default Fedora layout, there will be one `/dev/sda1` partition that holds the `/boot` directory and one `/dev/mapper/fedora-root` that holds the root file system.
Mount the root partition on the mount point.
# mount /dev/mapper/fedora-root /mnt/root
Mount the boot partition in the `boot` directory of the filesystem that you have mounted in the previous step.
# mount /dev/sda1 /mnt/root/boot/
For default Instalation in BTRF