root@xubuntu:/# apt-cache policy grub-common
grub-common:
  Installed: 2.04-1ubuntu12
  Candidate: 2.04-1ubuntu12
  Version table:
 *** 2.04-1ubuntu12 500
        500 mirror://mirrors.ubuntu.com/mirrors.txt eoan/main amd64 Packages
        100 /var/lib/dpkg/status


root@xubuntu:/# lsb_release -rd
Description:	Ubuntu 19.10
Release:	19.10

root@xubuntu:/# zfs list
NAME                         USED  AVAIL     REFER  MOUNTPOINT
GRUB2                        185M   166M       96K  /mnt
GRUB2/BOOT                   184M   166M     74.4M  legacy
GRUB2/BOOT@2019-11-17        109M      -      109M  -
OS                          28.4G  31.7G       96K  none
OS/ROOT                     26.6G  31.7G       96K  none
OS/ROOT/ubuntu              26.6G  31.7G     22.7G  /mnt/OS
OS/ROOT/ubuntu@2019-11-17   3.94G      -     22.0G  -
OS/home                     56.3M  31.7G       96K  none
OS/home/root                56.2M  31.7G     56.2M  /mnt/OS/root



root@xubuntu:/# update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
cannot open 'Destroy': no such pool