EBS ボリュームで MBR パーティションの 2 TiB 制限をバイパスするために、EC2 Ubuntu インスタンスのデフォルトの MBR パーティションスキームを GPT に変換する方法を教えてください。

# lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
(snip)
xvdf    202:80    0   3T  0 disk 
└─xvdf1 202:81    0   2T  0 part 
(snip)

# sudo gdisk /dev/xvdf
GPT fdisk (gdisk) version 1.0.1
Partition table scan:
  MBR: MBR only
 
    BSD: not present
  APM: not present
  GPT: not present

***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory. THIS OPERATION IS POTENTIALLY
    DESTRUCTIVE! Exit by
typing 'q' if you don't want to convert your MBR partitions
to GPT format!

Command (? for help): x                                            
Expert command (? for help): l                                     
Enter the sector alignment value (1-65536, default = 2048): 1      
Expert command (? for help): m   

Command (? for help): n                                                                                                        
Partition number (2-128, default 2): 128                                                                                
First sector (34-6291455966, default = 4294967296) or {+-}size{KMGTP}: 34                     
Last sector (34-2047, default = 2047) or {+-}size{KMGTP}:                                                  
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): ef02                                                     
Changed type of partition to 'BIOS boot partition'

Command (? for help): d                                                                                                         
Partition number (1-128): 1   

Command (? for help): n                                                                                                         
Partition number (1-128, default 1): 1                                                                                     
First sector (2048-6291455966, default = 2048) or {+-}size{KMGTP}:                                  
Last sector (2048-6291455966, default = 6291455966) or {+-}size{KMGTP}:                       
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300):                                                             
Changed type of partition to 'Linux filesystem'

Command (? for help): w                                                                                                        
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y                                                                                          
OK; writing new GUID partition table (GPT) to /dev/xvdf.
The operation has completed successfully.

# lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvdf    202:80   0   3T  0 disk 
└─xvdf1 202:81   0   3T  0 part 

# sudo e2fsck -f /dev/xvdf1
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
    
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
cloudimg-rootfs: 57524/262144000 files (0.0% non-contiguous), 16648272/536870655 blocks

# sudo resize2fs /dev/xvdf1
resize2fs 1.42.13 (17-May-2015)
Resizing the filesystem on /dev/xvdf1 to 786431739 (4k) blocks.
The filesystem on /dev/xvdf1 is now 786431739 (4k) blocks long.

sudo mount /dev/xvdf1 /mnt 
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo mount --bind /dev /mnt/dev
sudo chroot /mnt /bin/bash
grub-install /dev/xvdf
grub-mkdevicemap
update-grub
exit
sudo umount -l /mnt/dev
sudo umount -l /mnt/sys
sudo umount -l /mnt/proc
sudo umount -l /mnt

sudo mount /dev/xvdf1 /mnt 
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
sudo mount --bind /dev /mnt/dev
sudo chroot /mnt /bin/bash
grub-install /dev/xvdf
grub-mkdevicemap
echo "GRUB_DISABLE_OS_PROBER=true" > /etc/default/grub
echo "GRUB_FORCE_PARTUUID=" > /etc/default/grub.d/40-force-partuuid.cfg
update-grub
exit
sudo umount -l /mnt/dev
sudo umount -l /mnt/sys
sudo umount -l /mnt/proc
sudo umount -l /mnt