Comment 3 for bug 1659952

can you find in file /usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/dapper.py next string:

self.run_in_target('apt-get', '-y', '--force-yes', 'dist-upgrade',

and replace with:

self.run_in_target('apt-get', '-y', '--force-yes', '--option=Dpkg::Options::=--force-confnew', 'dist-upgrade',

and try to build new vm after that.

I describe similar situation on my blog http://anzhiganov.com/2016/11/02/869/. it was useful for me.