This bug was fixed in the package grub-installer - 1.128ubuntu14
--------------- grub-installer (1.128ubuntu14) eoan; urgency=medium
* When running on a ZFS filesystem udevadm returns an error which can be ignored. (LP: #1847228) * On zfs 0.8 cache is in /etc, do not attempt to copy it from /boot/zfs when it doesn't exist.
-- Jean-Baptiste Lallement <email address hidden> Tue, 08 Oct 2019 11:24:14 +0200
This bug was fixed in the package grub-installer - 1.128ubuntu14
---------------
grub-installer (1.128ubuntu14) eoan; urgency=medium
* When running on a ZFS filesystem udevadm returns an error
which can be ignored. (LP: #1847228)
* On zfs 0.8 cache is in /etc, do not attempt to copy it from
/boot/zfs when it doesn't exist.
-- Jean-Baptiste Lallement <email address hidden> Tue, 08 Oct 2019 11:24:14 +0200