Ubuntu server 20.04 zfs root and OCI

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$ ssh ubuntu@192.168.1.142
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$ sudo -i
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##
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apt-add-repository universe
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apt update
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apt install --yes debootstrap gdisk zfs-initramfs
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## find correct device name for below
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DISK=/dev/disk/by-id/ata-VBOX_HARDDISK_VB26c080f2-2bd16227
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USER=ubuntu
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HOST=server
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POOL=ubuntu
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##
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sgdisk --zap-all $DISK
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sgdisk --zap-all $DISK
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sgdisk -a1 -n1:24K:+1000K -t1:EF02 $DISK
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sgdisk     -n2:1M:+512M   -t2:EF00 $DISK
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sgdisk     -n3:0:+1G      -t3:BF01 $DISK
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sgdisk     -n4:0:0        -t4:BF01 $DISK
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sgdisk --print $DISK
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##
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zpool create -o ashift=12 -d \
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    -o feature@async_destroy=enabled \
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    -o feature@bookmarks=enabled \
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    -o feature@embedded_data=enabled \
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    -o feature@empty_bpobj=enabled \
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    -o feature@enabled_txg=enabled \
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    -o feature@extensible_dataset=enabled \
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    -o feature@filesystem_limits=enabled \
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    -o feature@hole_birth=enabled \
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    -o feature@large_blocks=enabled \
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    -o feature@lz4_compress=enabled \
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    -o feature@spacemap_histogram=enabled \
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    -o feature@userobj_accounting=enabled \
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    -O acltype=posixacl -O canmount=off -O compression=lz4 -O devices=off \
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    -O normalization=formD -O relatime=on -O xattr=sa \
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    -O mountpoint=/ -R /mnt bpool ${DISK}-part3
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zpool create -o ashift=12 \
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    -O acltype=posixacl -O canmount=off -O compression=lz4 \
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    -O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa \
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    -O mountpoint=/ -R /mnt rpool ${DISK}-part4
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zfs create -o canmount=off -o mountpoint=none rpool/ROOT
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zfs create -o canmount=off -o mountpoint=none bpool/BOOT
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zfs create -o canmount=noauto -o mountpoint=/ rpool/ROOT/ubuntu
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zfs mount rpool/ROOT/ubuntu
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zfs create -o canmount=noauto -o mountpoint=/boot bpool/BOOT/ubuntu
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zfs mount bpool/BOOT/ubuntu
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## Note: I skipped creating datasets for home, root, var/lib/ /var/log etc etc
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##
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debootstrap focal /mnt
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zfs set devices=off rpool
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##
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cat > /mnt/etc/netplan/01-netcfg.yaml<< EOF
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network:
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  version: 2
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  ethernets:
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    enp0s3:
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      dhcp4: true
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EOF
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##
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cat > /mnt/etc/apt/sources.list<< EOF
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deb http://archive.ubuntu.com/ubuntu focal main universe
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EOF
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##
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mount --rbind /dev  /mnt/dev
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mount --rbind /proc /mnt/proc
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mount --rbind /sys  /mnt/sys
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chroot /mnt /usr/bin/env DISK=$DISK bash --login
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##
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locale-gen --purge "en_US.UTF-8"
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update-locale LANG=en_US.UTF-8 LANGUAGE=en_US
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dpkg-reconfigure --frontend noninteractive locales
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echo "US/Central" > /etc/timezone
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dpkg-reconfigure -f noninteractive tzdata
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##
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passwd
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##
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apt install --yes --no-install-recommends linux-image-generic
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apt install --yes zfs-initramfs
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apt install --yes grub-pc
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grub-probe /boot
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##update-initramfs -u -k all  <- this does not work. try below
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KERNEL=`ls /usr/lib/modules/ | cut -d/ -f1 | sed 's/linux-image-//'`
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update-initramfs -u -k $KERNEL
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# edit /etc/default/grub
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GRUB_DEFAULT=0
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#GRUB_TIMEOUT_STYLE=hidden
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GRUB_TIMEOUT=5
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GRUB_CMDLINE_LINUX_DEFAULT=""
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GRUB_CMDLINE_LINUX="root=ZFS=rpool/ROOT/ubuntu console=tty1 console=ttyS0,115200"
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GRUB_TERMINAL="serial console"
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GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200"
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##
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update-grub
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grub-install $DISK
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##
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cat > /etc/systemd/system/zfs-import-bpool.service<< EOF
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[Unit]
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  DefaultDependencies=no
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  Before=zfs-import-scan.service
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  Before=zfs-import-cache.service
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[Service]
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  Type=oneshot
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  RemainAfterExit=yes
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  ExecStart=/sbin/zpool import -N -o cachefile=none bpool
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[Install]
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  WantedBy=zfs-import.target
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EOF
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systemctl enable zfs-import-bpool.service
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##
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zfs set mountpoint=legacy bpool/BOOT/ubuntu
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echo bpool/BOOT/ubuntu /boot zfs \
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    nodev,relatime,x-systemd.requires=zfs-import-bpool.service 0 0 >> /etc/fstab
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zfs snapshot bpool/BOOT/ubuntu@install
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zfs snapshot rpool/ROOT/ubuntu@install
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##
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systemctl enable serial-getty@ttyS0
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apt install ssh
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systemctl enable ssh
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##
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exit
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##
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mount | grep -v zfs | tac | awk '/\/mnt/ {print $3}' | xargs -i{} umount -lf {}
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zpool export -a
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##
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reboot
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** detach live cd

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KERNEL=ls /usr/lib/modules/ | cut -d/ -f1 | sed 's/linux-image-//'
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update-initramfs -u -k $KERNEL
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update-grub