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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.
Procedure
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.
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.
Create the mount point for the root partition.
Your bootloader should be now restored. Reboot your computer to boot into your normal system.
For Default Instalation in LVM.
Mount the root partition on the mount point.
Mount the boot partition in the `boot` directory of the filesystem that you have mounted in the previous step.
For default Instalation in BTRF
If you are using the default Fedora layout, there will be one `/dev/sda1` partition that holds the `/boot` directory and one `/dev/sda2` that holds the root file system.
Home Partition is mounted automatically under `/mnt/home`
Continue with the follow Procedure.