diff --git a/apache/build/Dockerfile b/apache/build/Dockerfile
index 610c59a..00beb16 100644
--- a/apache/build/Dockerfile
+++ b/apache/build/Dockerfile
@@ -67,8 +67,7 @@ RUN apt-get update && \
 RUN a2enmod headers proxy_http rewrite ssl proxy_wstunnel http2 proxy_connect
 
 ## Can remove this when SSL certificate are all valid ones
-RUN apt-get update && apt-get install -y --force-yes ssl-cert
-
+RUN apt-get update && apt-get install -y ssl-cert
 
 COPY entrypoint.sh /entrypoint.sh
 
diff --git a/cron/build/Dockerfile b/cron/build/Dockerfile
index 3b63160..7e7c5d1 100644
--- a/cron/build/Dockerfile
+++ b/cron/build/Dockerfile
@@ -1,7 +1,7 @@
 FROM docker.0k.io/debian:jessie
 
 RUN apt-get update && \
-    DEBIAN_FRONTEND=noninteractive apt-get install -y --force-yes cron moreutils && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y cron moreutils && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
diff --git a/mysql/hooks/install b/mysql/hooks/install
index a615b58..02262a2 100755
--- a/mysql/hooks/install
+++ b/mysql/hooks/install
@@ -9,11 +9,11 @@ GIT_0K_CLONE_OPTIONS=${GIT_0K_CLONE_OPTIONS:-""}
 GIT_0K_BASE=${GIT_0K_BASE:-"git.0k.io:/var/git"}
 
 
-apt-get install -y --force-yes cron kal-scripts
+apt-get install -y cron kal-scripts
 
 debconf-set-selections <<< "mysql-server mysql-server/root_password password $MYSQL_PASSWORD"
 debconf-set-selections <<< "mysql-server mysql-server/root_password_again password $MYSQL_PASSWORD"
-apt-get install -y --force-yes  mysql-server
+apt-get install -y  mysql-server
 
 
 
diff --git a/precise/0k-odoo-light/hooks/install b/precise/0k-odoo-light/hooks/install
index eae1954..206b804 100755
--- a/precise/0k-odoo-light/hooks/install
+++ b/precise/0k-odoo-light/hooks/install
@@ -15,7 +15,7 @@ DEPS_TO_REMOVE="git"
 
 KEEP_ONLY_PO=${KEEP_ONLY_PO:-fr en de}
 
-apt-get install -y --force-yes --no-install-recommends \
+apt-get install -y --no-install-recommends \
     $DEPS $DEPS_TO_REMOVE
 
 ## XXXvlab: should use base-0k code instead !
@@ -71,7 +71,7 @@ fi
 RELEASE=jessie VIRTUALENV= hooks/install
 )
 
-apt-get remove -y --force-yes $DEPS_TO_REMOVE
+apt-get remove -y $DEPS_TO_REMOVE
 apt-get autoremove -y
 
 rm -rf /opt/apps/git-sub /usr/lib/git-core/git-sub
diff --git a/precise/apt-cacher/hooks/install b/precise/apt-cacher/hooks/install
index f82c24a..7263429 100755
--- a/precise/apt-cacher/hooks/install
+++ b/precise/apt-cacher/hooks/install
@@ -3,7 +3,7 @@
 set -eux 
 
 
-apt-get install -y --force-yes apt-cacher-ng
+apt-get install -y apt-cacher-ng
 
 
 ## This is needed to enable https_port
diff --git a/precise/base-0k/hooks/install.d/00-base.sh b/precise/base-0k/hooks/install.d/00-base.sh
index f2ae3c9..b3fb49f 100755
--- a/precise/base-0k/hooks/install.d/00-base.sh
+++ b/precise/base-0k/hooks/install.d/00-base.sh
@@ -3,17 +3,17 @@
 set +eux
 
 apt-get update
-apt-get -y --force-yes install bash-completion wget bzip2 git-core \
+apt-get -y install bash-completion wget bzip2 git-core \
         less tmux mosh \
         sudo git vim file </dev/null
 
-apt-get -y --force-yes python-software-properties </dev/null ||
-    apt-get -y --force-yes software-properties-common </dev/null
+apt-get -y python-software-properties </dev/null ||
+    apt-get -y software-properties-common </dev/null
 
 
 case $(lsb_release -is) in
     Ubuntu)
-        apt-get install -y --force-yes language-pack-en </dev/null
+        apt-get install -y language-pack-en </dev/null
         ;;
     Debian)
         sed -ri 's/^\s*#\s*(en_US\.UTF-?8.*)\s*$/\1/g' /etc/locale.gen
diff --git a/precise/base-0k/hooks/install.d/05-shyaml.sh b/precise/base-0k/hooks/install.d/05-shyaml.sh
index b5bbb38..ec31941 100755
--- a/precise/base-0k/hooks/install.d/05-shyaml.sh
+++ b/precise/base-0k/hooks/install.d/05-shyaml.sh
@@ -2,6 +2,6 @@
 
 ## For shyaml
 
-apt-get install -y --force-yes python-pip libyaml-dev python-dev </dev/null
+apt-get install -y python-pip libyaml-dev python-dev </dev/null
 
 pip install shyaml --upgrade
diff --git a/precise/base-0k/hooks/install.d/20-kal-scripts.sh b/precise/base-0k/hooks/install.d/20-kal-scripts.sh
index 61d7a15..e14ffff 100755
--- a/precise/base-0k/hooks/install.d/20-kal-scripts.sh
+++ b/precise/base-0k/hooks/install.d/20-kal-scripts.sh
@@ -10,7 +10,7 @@ set -eux
 if ! [ -e /etc/apt/sources.list.d/kalysto.org.list ]; then
 
     ## Required to fetch our repository in https
-    apt-get install -y --force-yes apt-transport-https </dev/null
+    apt-get install -y apt-transport-https </dev/null
     cat <<EOF > /etc/apt/sources.list.d/kalysto.org.list
 
 ## vlab's shell libraries
@@ -18,7 +18,7 @@ deb https://deb.kalysto.org no-dist kal-alpha kal-beta kal-main
 
 EOF
     if ! type gpg >/dev/null; then
-        apt-get install -y --force-yes gnupg2 </dev/null
+        apt-get install -y gnupg2 </dev/null
     fi
     ## Include the GPG key
     wget -O - https://deb.kalysto.org/conf/public-key.gpg | apt-key add -
@@ -28,4 +28,4 @@ EOF
         -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
 fi
 
-apt-get install -y --force-yes kal-scripts </dev/null
+apt-get install -y kal-scripts </dev/null
diff --git a/precise/ca/hooks/install b/precise/ca/hooks/install
index cdbdb9e..69b6b7d 100755
--- a/precise/ca/hooks/install
+++ b/precise/ca/hooks/install
@@ -2,7 +2,7 @@
 
 set -eux # -x for verbose logging to juju debug-log
 
-apt-get install -y --force-yes kal-manage  ## this is for ``mkcrt``
+apt-get install -y kal-manage  ## this is for ``mkcrt``
 
 CA_SUBJECT=${CA_SUBJECT:-/C=FR/ST=France/O=Kalysto/CN=kal.fr/emailAddress=ca@kal.fr}
 
diff --git a/precise/git/hooks/install b/precise/git/hooks/install
index 0c6f115..7cbebdb 100755
--- a/precise/git/hooks/install
+++ b/precise/git/hooks/install
@@ -9,7 +9,7 @@ GIT_0K_BASE=${GIT_0K_BASE:-"0k-ro:/var/git"}
 GIT_0K_CLONE_OPTIONS=${GIT_0K_CLONE_OPTIONS:-""}
 
 
-apt-get install -y --force-yes kal-shlib-common
+apt-get install -y kal-shlib-common
 
 apt-get install -y bzr
 
diff --git a/precise/host/hooks/install.d/50-lxc.sh b/precise/host/hooks/install.d/50-lxc.sh
index 6247926..469cb4f 100755
--- a/precise/host/hooks/install.d/50-lxc.sh
+++ b/precise/host/hooks/install.d/50-lxc.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-apt-get install lxc -y --force-yes </dev/null
+apt-get install lxc -y </dev/null
 
 ## required to access the created lxc !
 if ! [ -e ~/.ssh/id_rsa ]; then
diff --git a/precise/host/hooks/install.d/60-docker.sh b/precise/host/hooks/install.d/60-docker.sh
index 566a67c..885c449 100755
--- a/precise/host/hooks/install.d/60-docker.sh
+++ b/precise/host/hooks/install.d/60-docker.sh
@@ -21,7 +21,7 @@ if [ -n "$just_installed" ]; then
                        grep "$docker_version" |
                        head -n 1 | xargs echo)"
         ## DOWNGRADE to 17.xx because 18.xx do not support registry v1
-        apt-get install -y --force-yes docker-ce="$version"
+        apt-get install -y docker-ce="$version"
         need_restart=true
     fi
 
diff --git a/precise/host/hooks/install.d/70-0k.sh b/precise/host/hooks/install.d/70-0k.sh
index cc87d17..f608833 100755
--- a/precise/host/hooks/install.d/70-0k.sh
+++ b/precise/host/hooks/install.d/70-0k.sh
@@ -268,6 +268,6 @@ fi
 
     ln -sfnv /opt/apps/0k-pgm/bin/* /usr/local/bin/
     find -L /usr/local/bin -maxdepth 1 -type l -ilname /opt/apps/0k-pgm/bin/\* -delete
-    apt-get install -y --force-yes pv buffer < /dev/null
+    apt-get install -y pv buffer < /dev/null
     apt-get install -y postgresql-client </dev/null
 )
diff --git a/precise/mirror/hooks/install b/precise/mirror/hooks/install
index c609519..76de81d 100755
--- a/precise/mirror/hooks/install
+++ b/precise/mirror/hooks/install
@@ -7,7 +7,7 @@ set -eux # -x for verbose logging to juju debug-log
 ## kal-manage provides the script /usr/lib/kal/dusk/sbin/ssh-cmd-validate
 ## used to validate any entrant connection to SSH.
 
-apt-get install -y --force-yes rsync kal-manage
+apt-get install -y rsync kal-manage
 
 
 mkdir -p /var/mirror
diff --git a/precise/pypi-cacher/hooks/install b/precise/pypi-cacher/hooks/install
index 364e6f1..bd9a8e1 100755
--- a/precise/pypi-cacher/hooks/install
+++ b/precise/pypi-cacher/hooks/install
@@ -2,7 +2,7 @@
 
 set -eux 
 
-apt-get install -y --force-yes python-pip
+apt-get install -y python-pip
 
 pip install devpi-server
 
diff --git a/precise/svn/hooks/install b/precise/svn/hooks/install
index 5c9cff7..e831c1f 100755
--- a/precise/svn/hooks/install
+++ b/precise/svn/hooks/install
@@ -3,7 +3,7 @@
 set -eux # -x for verbose logging to juju debug-log
 
 
-apt-get install -y --force-yes kal-shlib-pretty kal-scripts subversion
+apt-get install -y kal-shlib-pretty kal-scripts subversion
 
 
 mkdir -p /var/svn
diff --git a/precise/vpn/hooks/install b/precise/vpn/hooks/install
index c64b450..033a883 100755
--- a/precise/vpn/hooks/install
+++ b/precise/vpn/hooks/install
@@ -2,7 +2,7 @@
 
 set -eux 
 
-apt-get install -y --force-yes wget git kal-scripts python
+apt-get install -y wget git kal-scripts python
 
 if test -z "${RELEASE:-}"; then
     if type -p lsb_release; then
@@ -19,7 +19,7 @@ fi
 # ## Update only this repo:
 # apt-get update -o Dir::Etc::sourcelist="sources.list.d/swupdate.openvpn.net.list" \
 #     -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"
-# apt-get -y --force-yes install openvpn
+# apt-get -y install openvpn
 
 export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true
 dpkg -i deb/openvpn_*.deb || true
@@ -45,7 +45,7 @@ mkdir -p /var/run/openvpn /var/log/openvpn
 mkdir -p /opt/apps
 
 (
-    apt-get install -y --force-yes python-setuptools python-twisted python-crypto python-yaml python-pyptlib
+    apt-get install -y python-setuptools python-twisted python-crypto python-yaml python-pyptlib
     cd /opt/apps &&
     git clone https://git.torproject.org/pluggable-transports/obfsproxy.git &&
     cd obfsproxy &&
@@ -54,7 +54,7 @@ mkdir -p /opt/apps
 
 ## obfs4proxy does not work with OpenVPN for now.
 # (
-#     apt-get install --force-yes -y golang &&
+#     apt-get install -y golang &&
 #     cd /opt/apps &&
 #     mkdir obfs4 &&
 #     cd obfs4 &&
diff --git a/rsync-backup/build/Dockerfile b/rsync-backup/build/Dockerfile
index 19911ff..10aa6ec 100644
--- a/rsync-backup/build/Dockerfile
+++ b/rsync-backup/build/Dockerfile
@@ -6,7 +6,7 @@ MAINTAINER Valentin Lab <valentin.lab@kalysto.org>
 RUN apk add bash rsync sudo openssh-client
 
 # RUN apt-get update && \
-#     DEBIAN_FRONTEND=noninteractive apt-get install --force-yes -y --no-install-recommends rsync sudo openssh-client && \
+#     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends rsync sudo openssh-client && \
 #     apt-get clean && \
 #     rm -rf /var/lib/apt/lists/*