This bug was fixed in the package qtbase-opensource-src - 5.9.5+dfsg-0ubuntu2
--------------- qtbase-opensource-src (5.9.5+dfsg-0ubuntu2) bionic; urgency=medium
* Backport two upstream commits to fix duplex printing (LP: #1776173). Thanks to Robert Bredereck for the initial patch!
-- Dmitry Shachnev <email address hidden> Wed, 06 Feb 2019 10:47:55 +0300
This bug was fixed in the package qtbase- opensource- src - 5.9.5+dfsg-0ubuntu2
--------------- opensource- src (5.9.5+ dfsg-0ubuntu2) bionic; urgency=medium
qtbase-
* Backport two upstream commits to fix duplex printing (LP: #1776173).
Thanks to Robert Bredereck for the initial patch!
-- Dmitry Shachnev <email address hidden> Wed, 06 Feb 2019 10:47:55 +0300