postgresql packages need version numbers

src/freedombone-utils-postgresql

@@ -64,7 +64,7 @@ function install_postgresql {
     fi
     ${PROJECT_NAME}-pass -u root -a postgresql -p "$POSTGRESQL_PASSWORD"
 
-    apt-get -yq install postgresql postgresql-contrib postgresql-client
+    apt-get -yq install postgresql-9.6 postgresql-contrib-9.6 postgresql-client
     apt-get -yq remove --purge apache2-bin*
     if [ -d /etc/apache2 ]; then
         rm -rf /etc/apache2