diff --git a/install/usr/share/swarmlab.io/sec/swarmlab-sec b/install/usr/share/swarmlab.io/sec/swarmlab-sec
index 7ef938c..d5ea8c3 100755
--- a/install/usr/share/swarmlab.io/sec/swarmlab-sec
+++ b/install/usr/share/swarmlab.io/sec/swarmlab-sec
@@ -131,9 +131,6 @@ if [ -d "$Wdir/project" ]; then
 		COPY ssh/ \${SSHDIR}/
 
 		RUN export DEBIAN_FRONTEND=noninteractive && \
-		 apt-get update && apt-get $APTPARAM install -y openssh-server $PACKAGES \
-		 && apt-get autoremove --purge &&  apt clean \
-		 && rm -rf /var/lib/apt/lists/* \
 		 && rm -rf /usr/share/doc \
 		 && rm -rf /usr/share/man \
 		 && rm -rf /usr/share/locale \ 
@@ -251,9 +248,6 @@ if [ "$Wdir" ==  "$HOME" ]; then
 		COPY ssh/ \${SSHDIR}/
 
 		RUN export DEBIAN_FRONTEND=noninteractive && \
-		 apt-get update && apt-get $APTPARAM install -y openssh-server $PACKAGES \
-		 && apt-get autoremove --purge &&  apt clean \
-		 && rm -rf /var/lib/apt/lists/* \
 		 && rm -rf /usr/share/doc \
 		 && rm -rf /usr/share/man \
 		 && rm -rf /usr/share/locale \ 
@@ -629,7 +623,7 @@ show_instruction ()
     echo ""
     echo "  2. Execute programs inside master node, for example:"
     echo "     $ sudo su"
-    echo "     # apt update"
+    echo "     # apk update"
     echo "      *----------------------------------------------------*"
     echo "      | Default hostfile of connected nodes in the swarmlab |"
     echo "      | is automatically updated at /etc/opt/hosts         |"