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# ubuntu noninteractive with default values
# http://superuser.com/questions/164553/automatically-answer-yes-when-using-apt-get-install


DEBIAN_FRONTEND=noninteractive  dpkg --configure -a --force-confdef --force-confold

apt-get update
sudo DEBIAN_FRONTEND=noninteractive apt-get upgrade -y --force-yes -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold"
apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" dist-upgrade

# to install maintaner version use:
-o Dpkg::Options::="--force-confnew"


# on trusty
-force-yes

# on xenial use with
--allow-downgrades --allow