This bug was fixed in the package s390-tools - 2.6.0-0ubuntu3
--------------- s390-tools (2.6.0-0ubuntu3) cosmic; urgency=medium
* Make initramfs-tools zdev hooks not conflict with zfs. LP: #1788314
-- Dimitri John Ledkov <email address hidden> Wed, 22 Aug 2018 18:05:29 +0100
This bug was fixed in the package s390-tools - 2.6.0-0ubuntu3
---------------
s390-tools (2.6.0-0ubuntu3) cosmic; urgency=medium
* Make initramfs-tools zdev hooks not conflict with zfs. LP: #1788314
-- Dimitri John Ledkov <email address hidden> Wed, 22 Aug 2018 18:05:29 +0100