This bug was fixed in the package qtbase-opensource-src - 5.11.1+dfsg-7ubuntu3
--------------- qtbase-opensource-src (5.11.1+dfsg-7ubuntu3) cosmic; urgency=medium
* Backport upstream commit to fix duplex printing (LP: #1776173). Thanks to Robert Bredereck for the initial patch!
-- Dmitry Shachnev <email address hidden> Thu, 28 Feb 2019 13:26:39 +0300
This bug was fixed in the package qtbase- opensource- src - 5.11.1+ dfsg-7ubuntu3
--------------- opensource- src (5.11.1+ dfsg-7ubuntu3) cosmic; urgency=medium
qtbase-
* Backport upstream commit to fix duplex printing (LP: #1776173).
Thanks to Robert Bredereck for the initial patch!
-- Dmitry Shachnev <email address hidden> Thu, 28 Feb 2019 13:26:39 +0300