Tag: uuid

Migrate USB UEFI boot with iSCSI root Ubuntu to Proxmox VM

Migrate USB boot with iSCSI root Ubuntu to Proxmox VM

To convert Ubuntu to Proxmox Virtual Environment, the migration is required.

Ubuntu configuration

The Ubuntu server has following configuration

  • Boots from USB device with /boot and /boot/efi filesystems.
  • Connect to iSCSI host using GRUB2 configuration
  • Root file system / is on iSCSI disk


Create Proxmox VM

  • Create VM with 2GB disk
  • BIOS type is UEFI
  • Add EFI disk
  • Add Ubuntu Live CD and boot from CD

Create partition

Duplicating USB device partition to 2GB VM disk

Create filesystems

mkfs.vfat /dev/sda1
mkfs.btrfs /dev/sda2

Duplicate UUID

Duplicate UUID for /boot/efi

If don't change UUID for /boot/efi, later will need to change /etc/fstab file after reboot.

Duplicate UUID for /boot

Using following command to duplicate UUID for BTRFS filesystem

  • Retrieve partition from USB Ubuntu

    sfdisk -d /dev/sda
  • Create partitions on 2GB VM disk

  • Duplicate UUID of partition /boot/efi

  • Duplicate UUID of partition /boot

    btrfstune -U  /dev/sda2

Change network interface name in iSCSI configuration in Grub

  • Retrieve network interface name
ip a
  • Mount boot filesystem
mount /dev/sda2 /boot
  • Edit file /boot/grub/grub.cfg

Change all interface names in the grub.cfg.

linux /vmlinuz-5.4.0-113-generic ... ip=

Reboot VM


Modifying a BTRFS filesystem UUID

Change partition UUID in Ubuntu

Change partition UUID in Ubuntu

Generate UUID


Change one partition

sgdisk -U <uuid> /dev/sda1

Change multiple partitions

Run following command to retrieve partitions info

sfdisk -d /dev/sda > /tmp/sda.dsk

Edit the UUID in the file /tmp/sda.dsk.

Run following command to reimport the modified partitions

sfdisk /dev/sda < /tmp/sda.dsk