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#522 Reviewed partial for restoring bootloader
This commit is contained in:
Anthony McGlone
parent
597ee3427e
commit
8c2df2c465
1 changed files with 156 additions and 109 deletions
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@ -23,37 +23,160 @@ bootable by *GRUB2*.
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. Open the terminal.
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. Open the terminal.
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. Examine the partition layout and identify the `boot` and the `root` partition.
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. Examine the partition layout and identify the `boot` and the `root` partition.
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+
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----
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----
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sudo fdisk -l
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sudo fdisk -l
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----
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----
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== For Default Installation in LVM.
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== BTRFS filesystem
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. Create the mount point for the root partition.
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If your `root` partition is encrypted by LUKS, it must be decrypted:
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. Make sure the crypt module is in use:
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+
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+
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----
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----
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sudo modprobe dm-crypt
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----
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. Decrypt the `root` partition:
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+
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----
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sudo cryptsetup luksOpen <root_partition> myvolume
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----
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+
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The decrypted device (i.e. `myvolume`) will be accessible under `/dev/mapper/`.
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Mount the `root` partition:
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* For LUKS:
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+
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----
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mount <decrypted_device> /mnt -o subvol=root
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----
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* For non-LUKS:
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+
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----
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mount <root_partition> /mnt -o subvol=root
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----
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Mount the `boot` partition:
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----
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mount <boot_partition> /mnt/boot
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----
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Mount system processes and devices into the `root` filesystem:
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----
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mount -o bind /dev /mnt/dev
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mount -o bind /proc /mnt/proc
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mount -o bind /sys /mnt/sys
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mount -o bind /run /mnt/run
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----
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On UEFI systems, bind the efivars directory and mount the EFI system partition:
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----
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mount -o bind /sys/firmware/efi/efivars /mnt/sys/firmware/efi/efivars
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mount <efi_system_partition> /mnt/boot/efi
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----
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Change your filesystem to the one mounted under `/mnt/`:
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----
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chroot /mnt/
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----
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Re-install GRUB:
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* On UEFI systems, several packages are required:
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+
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----
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dnf reinstall shim-* grub2-efi-* grub2-common
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----
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* On BIOS systems, specify the disk where GRUB should be installed:
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+
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----
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grub2-install <disk>
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----
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Re-generate the GRUB configuration file:
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----
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grub2-mkconfig -o /boot/grub2/grub.cfg
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----
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Sync and exit the chroot:
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----
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sync && exit
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----
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Reboot the system.
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== LVM filesystem
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If your `root` partition is encrypted by LUKS, it must be decrypted:
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. Make sure the crypt module is in use:
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+
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----
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sudo modprobe dm-crypt
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----
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. Decrypt the `root` partition:
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+
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----
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sudo cryptsetup luksOpen <root_partition> myvolume
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----
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. Scan the LVM volumes for the volume group corresponding to the `root` partition:
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+
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----
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sudo vgscan
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----
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. Activate the volume group:
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+
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----
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sudo vgchange -ay <volume_group>
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----
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. Find the root volume:
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+
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----
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sudo lvs
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----
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+
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The root volume will be accessible under `/dev/`.
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Create a `root` directory under `/mnt`:
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----
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mkdir -p /mnt/root
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mkdir -p /mnt/root
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----
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----
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If you are using the default Fedora layout, there will be one `/dev/sda1`
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Mount the logical volume of the `root` partition:
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partition that holds the `/boot` directory and one `/dev/mapper/fedora-root`
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that holds the root file system.
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. Mount the root partition on the mount point.
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* For LUKS, substitute the root volume from above:
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+
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+
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----
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----
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mount /dev/mapper/fedora-root /mnt/root
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mount <root_volume> /mnt/root
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----
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----
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* For non-LUKS, use `lsblk` to find the `lvm` that corresponds to the `root` partition (the `lvm` should be under `/dev/mapper/`):
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. Mount the boot partition in the `boot` directory of the filesystem that you have mounted in the previous step.
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+
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+
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----
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----
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mount /dev/sda1 /mnt/root/boot/
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mount <lvm> /mnt/root
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----
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----
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. Mount system processes and devices into the root filesystem in `/mnt/root`.
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Mount the `boot` partition:
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+
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----
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mount <boot_partition> /mnt/root/boot
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----
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Mount system processes and devices into the `root` filesystem:
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----
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----
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mount -o bind /dev /mnt/root/dev
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mount -o bind /dev /mnt/root/dev
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mount -o bind /proc /mnt/root/proc
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mount -o bind /proc /mnt/root/proc
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@ -61,114 +184,38 @@ mount -o bind /sys /mnt/root/sys
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mount -o bind /run /mnt/root/run
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mount -o bind /run /mnt/root/run
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----
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----
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. If you use EFI boot, you may also want to bind the efivars and the EFI system partition:
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On UEFI systems, bind the efivars directory and mount the EFI system partition:
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+
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----
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----
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mount -o bind /sys/firmware/efi/efivars /mnt/root/sys/firmware/efi/efivars
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mount -o bind /sys/firmware/efi/efivars /mnt/root/sys/firmware/efi/efivars
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mount <efi system partition> /mnt/root/boot/efi
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mount <efi_system_partition> /mnt/root/boot/efi
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----
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----
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. Change your filesystem into the one mounted under `/mnt/root`.
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Change your filesystem to the one mounted under `/mnt/root`:
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----
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chroot /mnt/root/
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----
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Re-install GRUB and re-generate the GRUB configuration file:
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* On UEFI systems, several packages are required:
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+
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+
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----
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----
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chroot /mnt/root
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dnf reinstall shim-* grub2-efi-* grub2-common
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grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
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----
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----
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* On BIOS systems, specify the disk where GRUB should be installed:
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== For Default Installation in BTRFS
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. Create the mount point for the root partition.
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+
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+
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----
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----
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mkdir -p /mnt/
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grub2-install <disk>
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grub2-mkconfig -o /boot/grub2/grub.cfg
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----
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----
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If you are using the default Fedora layout, there will be one `/dev/sda1`
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Sync and exit the chroot:
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partition that holds the `/boot` directory and one `/dev/sda2` that holds the root file system.
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----
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----
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mount /dev/sda2 /mnt
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sync && exit
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mount /dev/sda1 /mnt/root/boot
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----
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----
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. Change your filesystem into the one mounted under `/mnt/root`.
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Reboot the system.
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+
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----
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chroot /mnt/root
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----
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IMPORTANT: Home Partition is mounted automatically under `/mnt/home`
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== For Default Installation in LUKS.
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. Make sure crypt module in use:
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+
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----
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sudo modprobe dm-crypt
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----
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. Find out which drive it was with the following command:
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+
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----
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sudo fdisk -l
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----
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You must mount `/dev/sda3 myvolume`
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. Use `cryptsetup`, device is accessible under `/dev/mapper/myvolume``
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+
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----
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sudo cryptsetup luksOpen /dev/sde3 myvolume
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----
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. Scan for LVM volumes and choose the right volume group name that you are looking for:
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+
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----
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sudo vgscan
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----
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. If it is eg. Fedora, activate it
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+
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----
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sudo vgchange -ay system
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----
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. Find out root volume
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+
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----
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sudo lvs
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----
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. Mount it with the following command:
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+
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----
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sudo mount /dev/system/root /mnt/
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----
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. To work in the volume use the following commands
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+
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----
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sudo mount --bind /dev /mnt/dev
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sudo mount --bind /dev/pts /mnt/dev/pts
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sudo mount --bind /proc /mnt/proc
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sudo mount --bind /sys /mnt/sys
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sudo chroot /mnt
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----
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IMPORTANT: consider mounting `/boot` also.
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== Continue with the follow Procedure.
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. Regenerate the *GRUB2* configuration file and reinstall the bootloader
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into the MBR, as described in xref:adding-other-operating-systems-grub2[Adding other operating systems to the *GRUB2* menu].
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. Exit this temporary root filesystem.
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+
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----
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exit
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----
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. Your bootloader should be now restored. Reboot your computer to boot into your normal system.
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----
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systemctl reboot
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----
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