This bug was fixed in the package apt-setup - 1:0.104ubuntu2
--------------- apt-setup (1:0.104ubuntu2) xenial; urgency=medium
* Fix mismerge that caused us not to disable the CD at the end of installation if any mirrors are present in the case of complete CD images (LP: #1529297).
-- Colin Watson <email address hidden> Wed, 30 Dec 2015 20:18:05 +0000
This bug was fixed in the package apt-setup - 1:0.104ubuntu2
---------------
apt-setup (1:0.104ubuntu2) xenial; urgency=medium
* Fix mismerge that caused us not to disable the CD at the end of
installation if any mirrors are present in the case of complete CD
images (LP: #1529297).
-- Colin Watson <email address hidden> Wed, 30 Dec 2015 20:18:05 +0000