This bug was fixed in the package virtualbox-lts-xenial - 4.3.40-dfsg-0ubuntu1.14.04.1~14.04.1
--------------- virtualbox-lts-xenial (4.3.40-dfsg-0ubuntu1.14.04.1~14.04.1) trusty; urgency=medium
* Use lts-xenial stack. Build only guest additions (LP: #1424769).
-- Gianfranco Costamagna <email address hidden> Fri, 01 Mar 2019 15:13:03 +0100
This bug was fixed in the package virtualbox- lts-xenial - 4.3.40- dfsg-0ubuntu1. 14.04.1~ 14.04.1
--------------- lts-xenial (4.3.40- dfsg-0ubuntu1. 14.04.1~ 14.04.1) trusty; urgency=medium
virtualbox-
* Use lts-xenial stack. Build only guest additions (LP: #1424769).
-- Gianfranco Costamagna <email address hidden> Fri, 01 Mar 2019 15:13:03 +0100