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How do I convert my linux disk from MBR to GPT with UEFI?

Announcing the arrival of Valued Associate #679: Cesar Manara

Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)

Come Celebrate our 10 Year Anniversary!Clonezilla restore MBR disk to 4TB disk (convert to GPT) — LINUX (not Windows!)How to correctly mount GPT partitions that might have originated on either Linux or WindowsConvert MBR to GPT partition formatCentOS 6 installation crashes when trying to boot media from BIOS set to UEFI modeDoes Windows Hyper-V Server 2012 support UEFI clients?BIOS to UEFI no backup restore possible?Installing Server 2012R2 on VM with GPT harddrive issuesDeploying windows 7 in UEFI GPT mode via WDSHow can I quickly clear GPT partition data from a disk?How to convert MBR to GPT and change from BIOS/legacy boot to UEFIWhat are the steps to convert an EBS boot volume from MBR to GPT without data loss? (Using Ubuntu)

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I have a linux box (Ubuntu 16.04) whose boot disk is partitioned using MBR. How can I convert it to GPT+UEFI?

asked Apr 15 at 19:40

Chris Jones

1406

add a comment |

I have a linux box (Ubuntu 16.04) whose boot disk is partitioned using MBR. How can I convert it to GPT+UEFI?

asked Apr 15 at 19:40

Chris Jones

1406

add a comment |

I have a linux box (Ubuntu 16.04) whose boot disk is partitioned using MBR. How can I convert it to GPT+UEFI?

asked Apr 15 at 19:40

Chris Jones

1406

I have a linux box (Ubuntu 16.04) whose boot disk is partitioned using MBR. How can I convert it to GPT+UEFI?

linux uefi gpt mbr

asked Apr 15 at 19:40

Chris Jones

1406

asked Apr 15 at 19:40

Chris Jones

1406

asked Apr 15 at 19:40

Chris Jones

1406

asked Apr 15 at 19:40

Chris Jones

1406

asked Apr 15 at 19:40

Chris Jones

1406

add a comment |

1 Answer
1

active

oldest

votes

Before starting, make sure you have a backup, and make sure to have a linux live boot ready to rescue your system. It's easy to mess this up!

Use gdisk to convert the partition table to GPT.

gdisk /dev/sda

Create the "BIOS boot" partition that GRUB needs.

n to create a new partition. Needs to be about 1MB. You can probably squeeze this in from sectors 34-2047. Use L or l to look up the code for "BIOS boot" (ef02).

Write the new partition table.

w

Reload the partition table.

partprobe /dev/sda

Re-install the GRUB boot loader using the new partition scheme.

grub-install /dev/sda

Optionally reboot to verify it's working. If you just need GPT and not UEFI, you can stop here.

Use gdisk to add an "EFI System" partition (ESP). Officially should be 100-500MB, but mine only used 130kB. Can be anywhere on the disk, so consider putting it at the end if you're using non-resizable media like a physical disk.

gdisk /dev/sda and use n to create the partition.

Give the ESP a distinctive label without whitespace like EFI-system, because we'll reference the partition label in fstab.

c to set the label.

Write the partition table.

w

Reload the partition table.

partprobe /dev/sda

Build the filesystem for the ESP.

mkfs -t vfat -v /dev/disk/by-partlabel/EFI-system

Create the ESP mount point.

mkdir /boot/efi

Add the ESP to /etc/fstab. It should look like this:

/dev/disk/by-partlabel/EFI-system /boot/efi vfat defaults 0 2

Mount the ESP.

mount /boot/efi

Install the GRUB EFI bootloader.

grub-install --target=x86_64-efi /dev/sda

Reboot.

Change the BIOS from BIOS boot to UEFI boot.

Use the one-time boot menu to force boot the disk. You may have to navigate to the disk -> EFI -> ubuntu -> grubx64.efi.

Re-install GRUB's EFI bootloader to update the UEFI boot selector.

grub-install

Resources:

The author of GPT has a verbose description of MBR, GPT, and UEFI.

Clonezilla restore MBR disk to 4TB disk (convert to GPT) -- LINUX (not Windows!) covers the first part of the process.

answered Apr 15 at 19:40

Chris Jones

1406

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

add a comment |

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Before starting, make sure you have a backup, and make sure to have a linux live boot ready to rescue your system. It's easy to mess this up!

Use gdisk to convert the partition table to GPT.

gdisk /dev/sda

Create the "BIOS boot" partition that GRUB needs.

n to create a new partition. Needs to be about 1MB. You can probably squeeze this in from sectors 34-2047. Use L or l to look up the code for "BIOS boot" (ef02).

Write the new partition table.

w

Reload the partition table.

partprobe /dev/sda

Re-install the GRUB boot loader using the new partition scheme.

grub-install /dev/sda

Optionally reboot to verify it's working. If you just need GPT and not UEFI, you can stop here.

Use gdisk to add an "EFI System" partition (ESP). Officially should be 100-500MB, but mine only used 130kB. Can be anywhere on the disk, so consider putting it at the end if you're using non-resizable media like a physical disk.

gdisk /dev/sda and use n to create the partition.

Give the ESP a distinctive label without whitespace like EFI-system, because we'll reference the partition label in fstab.

c to set the label.

Write the partition table.

w

Reload the partition table.

partprobe /dev/sda

Build the filesystem for the ESP.

mkfs -t vfat -v /dev/disk/by-partlabel/EFI-system

Create the ESP mount point.

mkdir /boot/efi

Add the ESP to /etc/fstab. It should look like this:

/dev/disk/by-partlabel/EFI-system /boot/efi vfat defaults 0 2

Mount the ESP.

mount /boot/efi

Install the GRUB EFI bootloader.

grub-install --target=x86_64-efi /dev/sda

Reboot.

Change the BIOS from BIOS boot to UEFI boot.

Use the one-time boot menu to force boot the disk. You may have to navigate to the disk -> EFI -> ubuntu -> grubx64.efi.

Re-install GRUB's EFI bootloader to update the UEFI boot selector.

grub-install

Resources:

The author of GPT has a verbose description of MBR, GPT, and UEFI.

Clonezilla restore MBR disk to 4TB disk (convert to GPT) -- LINUX (not Windows!) covers the first part of the process.

answered Apr 15 at 19:40

Chris Jones

1406

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

add a comment |

Before starting, make sure you have a backup, and make sure to have a linux live boot ready to rescue your system. It's easy to mess this up!

Use gdisk to convert the partition table to GPT.

gdisk /dev/sda

Create the "BIOS boot" partition that GRUB needs.

n to create a new partition. Needs to be about 1MB. You can probably squeeze this in from sectors 34-2047. Use L or l to look up the code for "BIOS boot" (ef02).

Write the new partition table.

w

Reload the partition table.

partprobe /dev/sda

Re-install the GRUB boot loader using the new partition scheme.

grub-install /dev/sda

Optionally reboot to verify it's working. If you just need GPT and not UEFI, you can stop here.

Use gdisk to add an "EFI System" partition (ESP). Officially should be 100-500MB, but mine only used 130kB. Can be anywhere on the disk, so consider putting it at the end if you're using non-resizable media like a physical disk.

gdisk /dev/sda and use n to create the partition.

Give the ESP a distinctive label without whitespace like EFI-system, because we'll reference the partition label in fstab.

c to set the label.

Write the partition table.

w

Reload the partition table.

partprobe /dev/sda

Build the filesystem for the ESP.

mkfs -t vfat -v /dev/disk/by-partlabel/EFI-system

Create the ESP mount point.

mkdir /boot/efi

Add the ESP to /etc/fstab. It should look like this:

/dev/disk/by-partlabel/EFI-system /boot/efi vfat defaults 0 2

Mount the ESP.

mount /boot/efi

Install the GRUB EFI bootloader.

grub-install --target=x86_64-efi /dev/sda

Reboot.

Change the BIOS from BIOS boot to UEFI boot.

Use the one-time boot menu to force boot the disk. You may have to navigate to the disk -> EFI -> ubuntu -> grubx64.efi.

Re-install GRUB's EFI bootloader to update the UEFI boot selector.

grub-install

Resources:

The author of GPT has a verbose description of MBR, GPT, and UEFI.

Clonezilla restore MBR disk to 4TB disk (convert to GPT) -- LINUX (not Windows!) covers the first part of the process.

answered Apr 15 at 19:40

Chris Jones

1406

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

add a comment |

Before starting, make sure you have a backup, and make sure to have a linux live boot ready to rescue your system. It's easy to mess this up!

Use gdisk to convert the partition table to GPT.

gdisk /dev/sda

Create the "BIOS boot" partition that GRUB needs.

n to create a new partition. Needs to be about 1MB. You can probably squeeze this in from sectors 34-2047. Use L or l to look up the code for "BIOS boot" (ef02).

Write the new partition table.

w

Reload the partition table.

partprobe /dev/sda

Re-install the GRUB boot loader using the new partition scheme.

grub-install /dev/sda

Optionally reboot to verify it's working. If you just need GPT and not UEFI, you can stop here.

Use gdisk to add an "EFI System" partition (ESP). Officially should be 100-500MB, but mine only used 130kB. Can be anywhere on the disk, so consider putting it at the end if you're using non-resizable media like a physical disk.

gdisk /dev/sda and use n to create the partition.

Give the ESP a distinctive label without whitespace like EFI-system, because we'll reference the partition label in fstab.

c to set the label.

Write the partition table.

w

Reload the partition table.

partprobe /dev/sda

Build the filesystem for the ESP.

mkfs -t vfat -v /dev/disk/by-partlabel/EFI-system

Create the ESP mount point.

mkdir /boot/efi

Add the ESP to /etc/fstab. It should look like this:

/dev/disk/by-partlabel/EFI-system /boot/efi vfat defaults 0 2

Mount the ESP.

mount /boot/efi

Install the GRUB EFI bootloader.

grub-install --target=x86_64-efi /dev/sda

Reboot.

Change the BIOS from BIOS boot to UEFI boot.

Use the one-time boot menu to force boot the disk. You may have to navigate to the disk -> EFI -> ubuntu -> grubx64.efi.

Re-install GRUB's EFI bootloader to update the UEFI boot selector.

grub-install

Resources:

The author of GPT has a verbose description of MBR, GPT, and UEFI.

Clonezilla restore MBR disk to 4TB disk (convert to GPT) -- LINUX (not Windows!) covers the first part of the process.

answered Apr 15 at 19:40

Chris Jones

1406

Before starting, make sure you have a backup, and make sure to have a linux live boot ready to rescue your system. It's easy to mess this up!

Use gdisk to convert the partition table to GPT.

gdisk /dev/sda

Create the "BIOS boot" partition that GRUB needs.

n to create a new partition. Needs to be about 1MB. You can probably squeeze this in from sectors 34-2047. Use L or l to look up the code for "BIOS boot" (ef02).

Write the new partition table.

w

Reload the partition table.

partprobe /dev/sda

Re-install the GRUB boot loader using the new partition scheme.

grub-install /dev/sda

Optionally reboot to verify it's working. If you just need GPT and not UEFI, you can stop here.

Use gdisk to add an "EFI System" partition (ESP). Officially should be 100-500MB, but mine only used 130kB. Can be anywhere on the disk, so consider putting it at the end if you're using non-resizable media like a physical disk.

gdisk /dev/sda and use n to create the partition.

Give the ESP a distinctive label without whitespace like EFI-system, because we'll reference the partition label in fstab.

c to set the label.

Write the partition table.

w

Reload the partition table.

partprobe /dev/sda

Build the filesystem for the ESP.

mkfs -t vfat -v /dev/disk/by-partlabel/EFI-system

Create the ESP mount point.

mkdir /boot/efi

Add the ESP to /etc/fstab. It should look like this:

/dev/disk/by-partlabel/EFI-system /boot/efi vfat defaults 0 2

Mount the ESP.

mount /boot/efi

Install the GRUB EFI bootloader.

grub-install --target=x86_64-efi /dev/sda

Reboot.

Change the BIOS from BIOS boot to UEFI boot.

Use the one-time boot menu to force boot the disk. You may have to navigate to the disk -> EFI -> ubuntu -> grubx64.efi.

Re-install GRUB's EFI bootloader to update the UEFI boot selector.

grub-install

Resources:

The author of GPT has a verbose description of MBR, GPT, and UEFI.

Clonezilla restore MBR disk to 4TB disk (convert to GPT) -- LINUX (not Windows!) covers the first part of the process.

answered Apr 15 at 19:40

Chris Jones

1406

answered Apr 15 at 19:40

Chris Jones

1406

answered Apr 15 at 19:40

Chris Jones

1406

answered Apr 15 at 19:40

Chris Jones

1406

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

add a comment |

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

The BIOS boot partition is only needed for doing legacy boot on a GPT partitioned disk. If you boot with UEFI, it is not needed and will not be used.

– Michael Hampton♦
Apr 16 at 1:40

add a comment |

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Vilaño, A Laracha Índice Patrimonio | Lugares e parroquias | Véxase tamén | Menú de navegación43°14′52″N 8°36′03″O / 43.24775, -8.60070