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This procedure shows the steps to install *GRUB2* on your _Master Boot Record_ (MBR) of your primary hard disk.
Before you start
Make sure you have the the *GRUB2* packages and the _os-prober_ package installed in your system.
$ dnf list installed | grep grub
To automatically collect information about your disks and operating systems installed on them, the `os-prober` package needs to be installed on your system.
Procedure
List block devices available on the system.
$ lsblk
----
. Identify the primary hard disk. Usually, it is the `sda` device.
. Install *GRUB2* in the MBR of the primary hard disk.
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# grub2-install /dev/sda
. Create a configuration file for *GRUB2*.
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# grub2-mkconfig -o /boot/grub2/grub.cfg
. Reboot your computer to boot with the newly installed bootloader.
.More information
* The `grub2-mkconfig` command creates a new configuration based on the currently running system. It collects information from the `/boot` partition (or directory), from the `/etc/default/grub` file, and the customizable scripts in `/etc/grub.d`.
* The configuration format is changing with time, and a new configuration file can become slightly incompatible with the older versions of the bootloader. Always run `grub2-install` before you create the configuration file with `grub2-mkconfig`.
* In Fedora, it is generally safe to edit `/boot/grub2/grub.cfg` manually. *Grubby* in Fedora patches the configuration when a kernel update is performed and will try to not make any other changes than what is necessary. Manual changes can be overwritten with `grub2-mkconfig` when the system gets upgraded with *Anaconda*. Customizations placed in `/etc/grub.d/40_custom` or `/boot/grub2/custom.cfg` files will survive running the `grub2-mkconfig` command.
Installing GRUB2 on a UEFI system
This procedure shows the steps to install *GRUB2* on a UEFI system on Fedora 18 or newer. The procedure consists of four parts.
[[create-an-esp]]
Creating an EFI System Partition
The UEFI firmware requires to boot from an _EFI System Partition_ on a disk with a GPT label. To create such a partition:
. List available block devices to find a place to create your ESP. +
$ lsblk -f -p
. Create at least a 128 MiB disk partition using a GPT label on the primary hard disk.
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# gdisk /dev/sda
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For the sake of this procedure, we assume that the created partition is recognized as `/dev/sda1`.
. Format the partition with the _FAT32_ file system.
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# mkfs.vfat /dev/sda1
. Create the `/boot/efi` directory as a mount point for the new partition.
+

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* The `grub2-mkconfig` command creates a new configuration based on the currently running system. It collects information from the `/boot` partition (or directory), from the `/etc/default/grub` file, and the customizable scripts in `/etc/grub.d`.
* The `grub2-mkconfig` command creates a new configuration based on the currently running system. It collects information from the `/boot` partition (or directory), from the `/etc/default/grub` file, and the customizable scripts in `/etc/grub.d`.
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Source string description
type: delimited block -
Flags
no-wrap, read-only
Source string location
./pages/grub2-bootloader.adoc:72
String age
7 months ago
Last updated
7 months ago
Source string age
7 months ago
Translation file
pot/master/pages/grub2-bootloader.pot, string 27