In this state, as I still have a shell in the live environment:
root@ubuntu:~# zpool status
  pool: bpool
 state: ONLINE
status: The pool is formatted using a legacy on-disk format.  The pool can
	still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
	pool will no longer be accessible on software that does not support
	feature flags.
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	bpool       ONLINE       0     0     0
	  sda3      ONLINE       0     0     0

errors: No known data errors

  pool: rpool
 state: ONLINE
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	rpool       ONLINE       0     0     0
	  sda4      ONLINE       0     0     0

errors: No known data errors


root@ubuntu:~# zfs list
NAME                                               USED  AVAIL     REFER  MOUNTPOINT
bpool                                             92.2M  1.66G      176K  /target/boot
bpool/BOOT                                        91.4M  1.66G      176K  none
bpool/BOOT/ubuntu_t62i31                          91.2M  1.66G     91.2M  /target/boot
rpool                                             5.44G   425G       96K  /target
rpool/ROOT                                        3.31G   425G       96K  none
rpool/ROOT/ubuntu_t62i31                          3.31G   425G     2.83G  /target
rpool/ROOT/ubuntu_t62i31/srv                        96K   425G       96K  /target/srv
rpool/ROOT/ubuntu_t62i31/usr                       200K   425G       96K  /target/usr
rpool/ROOT/ubuntu_t62i31/usr/local                 104K   425G      104K  /target/usr/local
rpool/ROOT/ubuntu_t62i31/var                       493M   425G       96K  /target/var
rpool/ROOT/ubuntu_t62i31/var/games                  96K   425G       96K  /target/var/games
rpool/ROOT/ubuntu_t62i31/var/lib                   492M   425G      376M  /target/var/lib
rpool/ROOT/ubuntu_t62i31/var/lib/AccountServices    96K   425G       96K  /target/var/lib/AccountServices
rpool/ROOT/ubuntu_t62i31/var/lib/NetworkManager     96K   425G       96K  /target/var/lib/NetworkManager
rpool/ROOT/ubuntu_t62i31/var/lib/apt              72.7M   425G     72.7M  /target/var/lib/apt
rpool/ROOT/ubuntu_t62i31/var/lib/dpkg             42.6M   425G     42.6M  /target/var/lib/dpkg
rpool/ROOT/ubuntu_t62i31/var/log                   448K   425G      448K  /target/var/log
rpool/ROOT/ubuntu_t62i31/var/mail                   96K   425G       96K  /target/var/mail
rpool/ROOT/ubuntu_t62i31/var/snap                   96K   425G       96K  /target/var/snap
rpool/ROOT/ubuntu_t62i31/var/spool                 112K   425G      112K  /target/var/spool
rpool/ROOT/ubuntu_t62i31/var/www                    96K   425G       96K  /target/var/www
rpool/USERDATA                                     332K   425G       96K  /target
rpool/USERDATA/andreas_ecfd2e                      124K   425G      124K  /target/home/andreas
rpool/USERDATA/root_ecfd2e                         112K   425G      112K  /target/root
rpool/swap                                        2.13G   427G       56K  -


root@ubuntu:~# mount -t zfs
rpool/ROOT/ubuntu_t62i31 on /target type zfs (rw,relatime,xattr,posixacl)
bpool/BOOT/ubuntu_t62i31 on /target/boot type zfs (rw,nodev,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/lib on /target/var/lib type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/lib/AccountServices on /target/var/lib/AccountServices type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/lib/apt on /target/var/lib/apt type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/lib/dpkg on /target/var/lib/dpkg type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/lib/NetworkManager on /target/var/lib/NetworkManager type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/srv on /target/srv type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/usr/local on /target/usr/local type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/games on /target/var/games type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/log on /target/var/log type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/mail on /target/var/mail type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/snap on /target/var/snap type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/spool on /target/var/spool type zfs (rw,relatime,xattr,posixacl)
rpool/ROOT/ubuntu_t62i31/var/www on /target/var/www type zfs (rw,relatime,xattr,posixacl)
rpool/USERDATA/andreas_ecfd2e on /target/home/andreas type zfs (rw,relatime,xattr,posixacl)
rpool/USERDATA/root_ecfd2e on /target/root type zfs (rw,relatime,xattr,posixacl)