This bug was fixed in the package plymouth - 0.9.3-1ubuntu2
--------------- plymouth (0.9.3-1ubuntu2) bionic; urgency=medium
* Make the lsb-release triggers interest-noawait, so that we don't block configuration of an Essential: yes package during upgrades. LP: #1750465.
-- Steve Langasek <email address hidden> Tue, 20 Mar 2018 23:15:58 -0700
This bug was fixed in the package plymouth - 0.9.3-1ubuntu2
---------------
plymouth (0.9.3-1ubuntu2) bionic; urgency=medium
* Make the lsb-release triggers interest-noawait, so that we don't block
configuration of an Essential: yes package during upgrades.
LP: #1750465.
-- Steve Langasek <email address hidden> Tue, 20 Mar 2018 23:15:58 -0700