Jammy (22.04) UEFI

This guide can be used to install Ubuntu onto a single disk with or without ZFS encryption.

The end result will be a pristine Ubuntu install with no GUI or anything other than the base system. You'll be able to install ubuntu-desktop, ubuntu-server-minimal or whatever takes your fancy afterwards.

It assumes the following:

  • Your system uses UEFI to boot

  • Your system is x86_64

  • You're mildly comfortable with ZFS, EFI and discovering system facts on your own (lsblk, dmesg, gdisk, ...)

Download the latest Ubuntu Desktop Jammy (22.04) Live image, write it to a USB drive and boot your system in EFI mode. You can use the server installation media if you want, although instructions are provided for installation using the desktop installer live session.

Configure Live Environment

Open a root shell

Open a terminal on the live installer session, then:

sudo -i

Confirm EFI support:

# dmesg | grep -i efivars
[    0.301784] Registered efivars operations

Source /etc/os-release

The file /etc/os-release defines variables that describe the running distribution. In particular, the $ID variable defined within can be used as a short name for the filesystem that will hold this installation.

source /etc/os-release
export ID="$ID"

Install helpers

apt update
apt install debootstrap gdisk zfsutils-linux

Generate /etc/hostid

zgenhostid -f 0x00bab10c

Define disk variables

For convenience and to reduce the likelihood of errors, set environment variables that refer to the devices that will be configured during the setup.

For many users, it is most convenient to place boot files (i.e., ZFSBootMenu and any loader responsible for launching it) on the the same disk that will hold the ZFS pool. However, some users may wish to dedicate an entire disk to the ZFS pool or create a multi-disk pool. A USB flash drive provides a convenient location for the boot partition. Fortunately, this alternative configuration is easily realized by simply defining a few environment variables differently.

Verify your target disk devices with lsblk. /dev/sda, /dev/sdb and /dev/nvme0n1 used below are examples.

First, define variables that refer to the disk and partition number that will hold boot files:

export BOOT_DISK="/dev/sda"
export BOOT_PART="1"

Next, define variables that refer to the disk and partition number that will hold the ZFS pool:

export POOL_DISK="/dev/sda"
export POOL_PART="2"

Disk preparation

Wipe partitions

wipefs -a "$POOL_DISK"
wipefs -a "$BOOT_DISK"

sgdisk --zap-all "$POOL_DISK"
sgdisk --zap-all "$BOOT_DISK"

Create EFI boot partition

sgdisk -n "${BOOT_PART}:1m:+512m" -t "${BOOT_PART}:ef00" "$BOOT_DISK"

Create zpool partition

sgdisk -n "${POOL_PART}:0:-10m" -t "${POOL_PART}:bf00" "$POOL_DISK"

ZFS pool creation

Create the zpool

zpool create -f -o ashift=12 \
 -O compression=lz4 \
 -O acltype=posixacl \
 -O xattr=sa \
 -O relatime=on \
 -o autotrim=on \
 -m none zroot "$POOL_DEVICE"

Create initial file systems

zfs create -o mountpoint=none zroot/ROOT
zfs create -o mountpoint=/ -o canmount=noauto zroot/ROOT/${ID}
zfs create -o mountpoint=/home zroot/home

zpool set bootfs=zroot/ROOT/${ID} zroot


It is important to set the property canmount=noauto on any file systems with mountpoint=/ (that is, on any additional boot environments you create). Without this property, the OS will attempt to automount all ZFS file systems and fail when multiple file systems attempt to mount at /; this will prevent your system from booting. Automatic mounting of / is not required because the root file system is explicitly mounted in the boot process.

Also note that, unlike many ZFS properties, canmount is not inheritable. Therefore, setting canmount=noauto on zroot/ROOT is not sufficient, as any subsequent boot environments you create will default to canmount=on. It is necessary to explicitly set the canmount=noauto on every boot environment you create.

Export, then re-import with a temporary mountpoint of /mnt

zpool export zroot
zpool import -N -R /mnt zroot
zfs mount zroot/ROOT/${ID}
zfs mount zroot/home

Verify that everything is mounted correctly

# mount | grep mnt
zroot/ROOT/ubuntu on /mnt type zfs (rw,relatime,xattr,posixacl)
zroot/home on /mnt/home type zfs (rw,relatime,xattr,posixacl)

Install Ubuntu

debootstrap jammy /mnt

Copy files into the new install

cp /etc/hostid /mnt/etc
cp /etc/resolv.conf /mnt/etc

Chroot into the new OS

mount -t proc proc /mnt/proc
mount -t sysfs sys /mnt/sys
mount -B /dev /mnt/dev
mount -t devpts pts /mnt/dev/pts
chroot /mnt /bin/bash

Basic Ubuntu Configuration

Set a hostname

echo 'YOURHOSTNAME' > /etc/hostname
echo -e '\tYOURHOSTNAME' >> /etc/hosts

Set a root password


Configure apt. Use other mirrors if you prefer.

cat <<EOF > /etc/apt/sources.list
# Uncomment the deb-src entries if you need source packages

deb http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse

deb http://archive.canonical.com/ubuntu/ jammy partner
# deb-src http://archive.canonical.com/ubuntu/ jammy partner

Update the repository cache and system

apt update
apt upgrade

Install additional base packages

apt install --no-install-recommends linux-generic locales keyboard-configuration console-setup


The --no-install-recommends flag is used here to avoid installing recommended, but not strictly needed, packages (including grub2).

Configure packages to customize local and console properties

dpkg-reconfigure locales tzdata keyboard-configuration console-setup


You should always enable the en_US.UTF-8 locale because some programs require it.

ZFS Configuration

Install required packages

apt install dosfstools zfs-initramfs zfsutils-linux

Enable systemd ZFS services

systemctl enable zfs.target
systemctl enable zfs-import-cache
systemctl enable zfs-mount
systemctl enable zfs-import.target

Configure initramfs-tools

No required steps

Rebuild the initramfs

update-initramfs -c -k all

Install and configure ZFSBootMenu

Set ZFSBootMenu properties on datasets

Assign command-line arguments to be used when booting the final kernel. Because ZFS properties are inherited, assign the common properties to the ROOT dataset so all children will inherit common arguments by default.

zfs set org.zfsbootmenu:commandline="quiet loglevel=4" zroot/ROOT

Create a vfat filesystem

mkfs.vfat -F32 "$BOOT_DEVICE"

Create an fstab entry and mount

cat << EOF >> /etc/fstab
$( blkid | grep "$BOOT_DEVICE" | cut -d ' ' -f 2 ) /boot/efi vfat defaults 0 0

mkdir -p /boot/efi
mount /boot/efi

Install ZFSBootMenu

apt install curl

Fetch a prebuilt ZFSBootMenu EFI executable, saving it to the EFI system partition:

mkdir -p /boot/efi/EFI/ZBM
curl -o /boot/efi/EFI/ZBM/VMLINUZ.EFI -L https://get.zfsbootmenu.org/efi

Configure EFI boot entries

mount -t efivarfs efivarfs /sys/firmware/efi/efivars
apt install efibootmgr
efibootmgr -c -d "$BOOT_DISK" -p "$BOOT_PART" \
  -L "ZFSBootMenu (Backup)" \

efibootmgr -c -d "$BOOT_DISK" -p "$BOOT_PART" \
  -L "ZFSBootMenu" \

See also

Some systems can have issues with EFI boot entries. If you reboot and do not see the above entries in your EFI selection screen (usually accessible through an F key during POST), you might need to use a well-known EFI file name. See Portable EFI for help with this. Your existing ESP can be used, in place of an external USB drive.

Refer to zbm-kcl.8 and zfsbootmenu.7 for details on configuring the boot-time behavior of ZFSBootMenu.

Prepare for first boot

Exit the chroot, unmount everything

umount -n -R /mnt

Export the zpool and reboot

zpool export zroot