apt-get fixes (#406)

* apt-fixes

* DEBIAN_FRONTEND teletype at the end

image/Dockerfile

@@ -9,6 +9,8 @@ RUN /bd_build/prepare.sh && \
 	/bd_build/fix_pam_bug.sh && \
 	/bd_build/cleanup.sh
 
+ENV DEBIAN_FRONTEND teletype
+
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US:en
 ENV LC_ALL en_US.UTF-8

image/prepare.sh

@@ -28,14 +28,17 @@ ln -sf /bin/true /sbin/initctl
 dpkg-divert --local --rename --add /usr/bin/ischroot
 ln -sf /bin/true /usr/bin/ischroot
 
+# apt-utils fix for Ubuntu 16.04
+$minimal_apt_get_install apt-utils
+
 ## Install HTTPS support for APT.
 $minimal_apt_get_install apt-transport-https ca-certificates
 
 ## Install add-apt-repository
 $minimal_apt_get_install software-properties-common
 
 ## Upgrade all packages.
-apt-get dist-upgrade -y --no-install-recommends
+apt-get dist-upgrade -y --no-install-recommends -o Dpkg::Options::="--force-confold"
 
 ## Fix locale.
 $minimal_apt_get_install language-pack-en