Public bug reported:

Conventionally, ZFS is contained within GPT partitions.  While setting
up zfs using ubiquity, legacy/bios booted system use MBR partition
tables.  This is especially problematic since MBR partitions are
restricted to 2TB.

GPT disks must contain a "Bios_Grub" partition in order to be bootable
from Bios/Legacy systems.  This partition can be created using the
command "sgdisk -a1 -n1:256K:+768K -t1:EF02 <disk>", where all the 1's
in that command specify an available partition number.

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1858966

Title:
  Ubiquity/zfs/zsys creates MBR table when LiveCD legacy/bios booted

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