diff --git a/core_functions.sh b/core_functions.sh
index b366252..82034d0 100644
--- a/core_functions.sh
+++ b/core_functions.sh
@@ -426,17 +426,26 @@ function addSpecificRepoFct () {
 
 #
 # find and execute Pre/Post install functions for a specific app
-# input : unique ID
+# input : unique ID, pre/post
 #
 function processAppTrtFct () {
-  for i in $AppsTrtFct; do
-    appTrtFct=(${i//;/ })
-    if [ "${appTrtFct[0]}" == "$1" ]; then
-      printf "[TRT] package -- $1 -- "
-      printf "post install processed by -- ${appTrtFct[1]}\n"
-      eval "${appTrtFct[1]}"
-    fi
-  done
+  if [ "$2" == "post" ]; then
+    for i in $AppsPostTrtFct; do
+      appPostTrtFct=(${i//;/ })
+      if [ "${appPostTrtFct[0]}" == "$1" ]; then
+        printf "[TRT][POST][$1][${appPostTrtFct[1]}]\n"
+        eval "${appPostTrtFct[1]}"
+      fi
+    done
+  else
+    for i in $AppsPreTrtFct; do
+      appPreTrtFct=(${i//;/ })
+      if [ "${appPreTrtFct[0]}" == "$1" ]; then
+        printf "[TRT][PRE][$1][${appPreTrtFct[1]}]\n"
+        eval "${appPreTrtFct[1]}"
+      fi
+    done
+  fi
 }
 
 #
@@ -459,8 +468,9 @@ function installAppsFromList () {
   for i in $Apps; do
     app=(${i//;/ })
     if [ "${app[2]}" == "$1" ]; then
+      processAppTrtFct ${app[3]} post
       installPackage ${app[1]} ${app[0]}
-      processAppTrtFct ${app[3]}
+      processAppTrtFct ${app[3]} post
     fi
   done
 }
@@ -503,8 +513,9 @@ function installAppsFromListMenu () {
       for i in $Apps; do
         app=(${i//;/ })
         if [ "${app[3]}" == "${pkgToInstall//\"}" ]; then
+          processAppTrtFct ${app[3]} pre
           installPackage ${app[1]} ${app[0]}
-          processAppTrtFct ${app[3]}
+          processAppTrtFct ${app[3]} post
         fi
       done
     done
diff --git a/install_functions_ub1604.sh b/install_functions_ub1604.sh
index 25079ed..e0d0dd1 100644
--- a/install_functions_ub1604.sh
+++ b/install_functions_ub1604.sh
@@ -70,8 +70,6 @@ function installEbookMenu () {
 # install Internet Apps (headless)
 #
 function installInternet () {
-  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
-         "setting as do not add repo"
   installAppsFromList internet
 }
 
@@ -79,8 +77,6 @@ function installInternet () {
 # install Internet Apps (Menu)
 #
 function installInternetMenu () {
-  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
-         "setting as do not add repo"
   installAppsFromListMenu internet
 }
 
@@ -166,20 +162,14 @@ function installGamesMenu () {
 # Steam (headless)
 #
 function installSteam () {
-  runCmd "echo \"steam steam/purge note\" | sudo debconf-set-selections" \
-         "accepting steam licence"
-  runCmd "echo \"steam steam/license note\" | sudo debconf-set-selections" \
-         "accepting steam licence 2/3"
-  runCmd "echo \"steam steam/question select I AGREE\" | sudo debconf-set-selections" \
-         "accepting steam licence 3/3"
-  installPackage apt steam
+  installAppsFromList steam
 }
 
 #
 # Steam (Menu)
 #
 function installSteamMenu () {
-  installPackage apt steam
+  installAppsFromListMenu steam
 }
 
 #
@@ -200,8 +190,6 @@ function installBurningToolsMenu () {
 # install Network Apps (headless)
 #
 function installNetTools () {
-  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
-         "setting Wireshark as root only"
   installAppsFromList nettools
 }
 
@@ -209,8 +197,6 @@ function installNetTools () {
 # install Network Apps (Menu)
 #
 function installNetToolsMenu () {
-  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
-         "setting Wireshark as root only"
   installAppsFromListMenu nettools
 }
 
@@ -616,8 +602,6 @@ function installJavascriptMenu () {
 # install JAVA 10 (headless)
 #
 function installJava10 () {
-  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
-         "accepting Oracle Java SE 10 licence agreement"
   installAppsFromList java10
 }
 
@@ -625,8 +609,6 @@ function installJava10 () {
 # install JAVA 10 (Menu)
 #
 function installJava10Menu () {
-  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
-         "accepting Oracle Java SE 10 licence agreement"
   installAppsFromListMenu java10
 }
 
diff --git a/install_functions_ub1804.sh b/install_functions_ub1804.sh
index 04681d6..f6eb00b 100644
--- a/install_functions_ub1804.sh
+++ b/install_functions_ub1804.sh
@@ -76,8 +76,6 @@ function installEbookMenu () {
 # install Internet Apps (headless)
 #
 function installInternet () {
-  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
-         "setting as do not add repo"
   installAppsFromList internet
 }
 
@@ -85,8 +83,6 @@ function installInternet () {
 # install Internet Apps (Menu)
 #
 function installInternetMenu () {
-  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
-         "setting as do not add repo"
   installAppsFromListMenu internet
 }
 
@@ -190,20 +186,14 @@ function installGamesMenu () {
 # Steam (headless)
 #
 function installSteam () {
-  runCmd "echo \"steam steam/purge note\" | sudo debconf-set-selections" \
-         "accepting steam licence"
-  runCmd "echo \"steam steam/license note\" | sudo debconf-set-selections" \
-         "accepting steam licence 2/3"
-  runCmd "echo \"steam steam/question select I AGREE\" | sudo debconf-set-selections" \
-         "accepting steam licence 3/3"
-  installPackage apt steam
+  installAppsFromList steam
 }
 
 #
 # Steam (Menu)
 #
 function installSteamMenu () {
-  installPackage apt steam
+  installAppsFromListMenu steam
 }
 
 #
@@ -224,8 +214,6 @@ function installBurningToolsMenu () {
 # install Network Apps (headless)
 #
 function installNetTools () {
-  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
-         "setting Wireshark as root only"
   installAppsFromList nettools
 }
 
@@ -233,8 +221,6 @@ function installNetTools () {
 # install Network Apps (Menu)
 #
 function installNetToolsMenu () {
-  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
-         "setting Wireshark as root only"
   installAppsFromListMenu nettools
 }
 
@@ -585,8 +571,6 @@ function installJavascriptMenu () {
 # install JAVA 10 (headless)
 #
 function installJava10 () {
-  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
-         "accepting Oracle Java SE 10 licence agreement"
   installAppsFromList java10
 }
 
@@ -594,8 +578,6 @@ function installJava10 () {
 # install JAVA 10 (Menu)
 #
 function installJava10Menu () {
-  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
-         "accepting Oracle Java SE 10 licence agreement"
   installAppsFromListMenu java10
 }
 
diff --git a/repo_functions_ub1604.sh b/repo_functions_ub1604.sh
index c244717..48ab919 100644
--- a/repo_functions_ub1604.sh
+++ b/repo_functions_ub1604.sh
@@ -200,6 +200,7 @@ weppy;pip;python;weppy
 py-term;pip;python;py-term
 jstest-gtk;apt;games;jstest-gtk
 dosbox;apt;games;dosbox
+steam;apt;steam;steam
 brasero;apt;burningtools;brasero
 k3b;apt;burningtools;k3b
 k3b-extrathemes;apt;burningtools;k3b-extrathemes
@@ -1175,6 +1176,56 @@ function addRepo_AndroidStudio () {
   addPPA ppa:maarten-fonville/android-studio
 }
 
+#-----------------------------------------------------------------------------#
+# Package pre install functions list                                         #
+#-----------------------------------------------------------------------------#
+
+#
+# list of pre install functions
+# fields : unique ID, function to process after install
+#
+AppsPreTrtFct="opera-stable;opera_PreTrtFct
+steam;steam_PreTrtFct
+wireshark;wireshark_PreTrtFct
+oracle-java10-installer;java10_PreTrtFct
+oracle-java10-set-default;java10_PreTrtFct"
+
+#
+# JAVA 10
+#
+function java10_PreTrtFct () {
+  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
+         "accepting Oracle Java SE 10 licence agreement"
+}
+
+#
+# Opera
+#
+function opera_PreTrtFct () {
+  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
+         "setting as do not add repo"
+}
+
+#
+# Steam
+#
+function steam_PreTrtFct () {
+  runCmd "echo \"steam steam/purge note\" | sudo debconf-set-selections" \
+         "accepting steam licence"
+  runCmd "echo \"steam steam/license note\" | sudo debconf-set-selections" \
+         "accepting steam licence 2/3"
+  runCmd "echo \"steam steam/question select I AGREE\" | sudo debconf-set-selections" \
+         "accepting steam licence 3/3"
+}
+
+#
+# Wireshark
+#
+function wireshark_PreTrtFct () {
+  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
+         "setting Wireshark as root only"
+}
+
 #-----------------------------------------------------------------------------#
 # Package post install functions list                                         #
 #-----------------------------------------------------------------------------#
@@ -1183,17 +1234,18 @@ function addRepo_AndroidStudio () {
 # list of post install functions
 # fields : unique ID, function to process after install
 #
-AppsTrtFct="nitrogen;nitrogen_TrtFct
-mongodb;mongodb_TrtFct
-qttools5-dev-tools;qt_TrtFct
-plank;plank_TrtFct
-androidstudio;android_TrtFct
-nodejs8lts;nodejs8lts_TrtFct"
+AppsPostTrtFct="nitrogen;nitrogen_PostTrtFct
+mongodb;mongodb_PostTrtFct
+qttools5-dev-tools;qt_PostTrtFct
+plank;plank_PostTrtFct
+androidstudio;android_PostTrtFct
+nodejs8lts;nodejs8lts_PostTrtFct
+mc;mc_PostTrtFct"
 
 #
+# NodeJS 8 LTS
 #
-#
-function nodejs8lts_TrtFct () {
+function nodejs8lts_PostTrtFct () {
   msg "Sanitizing NodeJS install"
   if which /usr/local/bin/node >/dev/null; then
     runCmd "sudo rm /usr/local/bin/node" \
@@ -1206,7 +1258,7 @@ function nodejs8lts_TrtFct () {
 #
 # Android Env for adb, fastboot, ....
 #
-function android_TrtFct () {
+function android_PostTrtFct () {
   msg "Adding Android devices UDEV rules"
 
   sudo sh -c "echo 'SUBSYSTEM==\"usb\", ATTR{idVendor}==\"0502\", MODE=\"0666\", OWNER=\""$myHomedir"\" # Acer\n\
@@ -1255,7 +1307,7 @@ SUBSYSTEM==\"usb\", ATTR{idVendor}==\"19d2\", MODE=\"0666\", OWNER=\""$myHomedir
 #
 # Plank themes
 #TODO: test it
-function plank_TrtFct () {
+function plank_PostTrtFct () {
   typeset ret_code
 
   if ! (( $(ps -ef | grep -v grep | grep plank | wc -l) > 0 )); then
@@ -1283,7 +1335,7 @@ function plank_TrtFct () {
 #
 # QT5 Dev Tools
 #
-function qt_TrtFct () {
+function qt_PostTrtFct () {
   runCmd "sudo ln -s /usr/share/qtchooser/qt5-x86_64-linux-gnu.conf /usr/lib/x86_64-linux-gnu/qtchooser/default.conf" \
          "set QT5 as default"
 
@@ -1298,7 +1350,7 @@ function qt_TrtFct () {
 #
 # MongoDB 3 CE
 #
-function mongodb_TrtFct () {
+function mongodb_PostTrtFct () {
   runCmd "sudo systemctl enable mongod.service" \
          "enabling mongod service at boot"
   runCmd "sudo systemctl start mongod.service" \
@@ -1308,7 +1360,7 @@ function mongodb_TrtFct () {
 #
 # nitrogen post install function
 #
-function nitrogen_TrtFct () {
+function nitrogen_PostTrtFct () {
   if isMate; then
     runCmd "gsettings set org.mate.background draw-background false" \
            "disabling Caja background management"
diff --git a/repo_functions_ub1804.sh b/repo_functions_ub1804.sh
index 6011578..d74c1f8 100644
--- a/repo_functions_ub1804.sh
+++ b/repo_functions_ub1804.sh
@@ -181,6 +181,7 @@ weppy;pip;python;weppy
 py-term;pip;python;py-term
 jstest-gtk;apt;games;jstest-gtk
 dosbox;apt;games;dosbox
+steam;apt;steam;steam
 brasero;apt;burningtools;brasero
 k3b;apt;burningtools;k3b
 k3b-extrathemes;apt;burningtools;k3b-extrathemes
@@ -983,6 +984,55 @@ function addRepo_AndroidStudio () {
   addPPA ppa:maarten-fonville/android-studio
 }
 
+#-----------------------------------------------------------------------------#
+# Package pre install functions list                                         #
+#-----------------------------------------------------------------------------#
+
+#
+# list of pre install functions
+# fields : unique ID, function to process after install
+#
+AppsPreTrtFct="opera-stable;opera_PreTrtFct
+steam;steam_PreTrtFct
+wireshark;wireshark_PreTrtFct
+oracle-java10-installer;java10_PreTrtFct
+oracle-java10-set-default;java10_PreTrtFct"
+
+#
+# JAVA 10
+#
+function java10_PreTrtFct () {
+  runCmd "echo oracle-java10-installer shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections" \
+         "accepting Oracle Java SE 10 licence agreement"
+}
+#
+# Opera
+#
+function opera_PreTrtFct () {
+  runCmd "echo opera-stable opera-stable/add-deb-source boolean false | sudo debconf-set-selections" \
+         "setting as do not add repo"
+}
+
+#
+# Steam
+#
+function steam_PreTrtFct () {
+  runCmd "echo \"steam steam/purge note\" | sudo debconf-set-selections" \
+         "accepting steam licence"
+  runCmd "echo \"steam steam/license note\" | sudo debconf-set-selections" \
+         "accepting steam licence 2/3"
+  runCmd "echo \"steam steam/question select I AGREE\" | sudo debconf-set-selections" \
+         "accepting steam licence 3/3"
+}
+
+#
+# Wireshark
+#
+function wireshark_PreTrtFct () {
+  runCmd "echo wireshark-common wireshark-common/install-setuid boolean true | sudo debconf-set-selections" \
+         "setting Wireshark as root only"
+}
+
 #-----------------------------------------------------------------------------#
 # Package post install functions list                                         #
 #-----------------------------------------------------------------------------#
@@ -991,17 +1041,17 @@ function addRepo_AndroidStudio () {
 # list of post install functions
 # fields : unique ID, function to process after install
 #
-AppsTrtFct="nitrogen;nitrogen_TrtFct
-mongodb;mongodb_TrtFct
-qttools5-dev-tools;qt_TrtFct
-plank;plank_TrtFct
-androidstudio;android_TrtFct
-nodejs8lts;nodejs8lts_TrtFct"
+AppsPostTrtFct="nitrogen;nitrogen_PostTrtFct
+mongodb;mongodb_PostTrtFct
+qttools5-dev-tools;qt_PostTrtFct
+plank;plank_PostTrtFct
+androidstudio;android_PostTrtFct
+nodejs8lts;nodejs8lts_PostTrtFct"
 
 #
+# NodeJS 8 LTS
 #
-#
-function nodejs8lts_TrtFct () {
+function nodejs8lts_PostTrtFct () {
   msg "Sanitizing NodeJS install"
   if which /usr/local/bin/node >/dev/null; then
     runCmd "sudo rm /usr/local/bin/node" \
@@ -1014,7 +1064,7 @@ function nodejs8lts_TrtFct () {
 #
 # Android Env for adb, fastboot, ....
 #
-function android_TrtFct () {
+function android_PostTrtFct () {
   msg "Adding Android devices UDEV rules"
 
   sudo sh -c "echo 'SUBSYSTEM==\"usb\", ATTR{idVendor}==\"0502\", MODE=\"0666\", OWNER=\""$myHomedir"\" # Acer\n\
@@ -1063,7 +1113,7 @@ SUBSYSTEM==\"usb\", ATTR{idVendor}==\"19d2\", MODE=\"0666\", OWNER=\""$myHomedir
 #
 # Plank themes
 #TODO: test it
-function plank_TrtFct () {
+function plank_PostTrtFct () {
   typeset ret_code
 
   if ! (( $(ps -ef | grep -v grep | grep plank | wc -l) > 0 )); then
@@ -1091,7 +1141,7 @@ function plank_TrtFct () {
 #
 # QT5 Dev Tools
 #
-function qt_TrtFct () {
+function qt_PostTrtFct () {
   runCmd "sudo ln -s /usr/share/qtchooser/qt5-x86_64-linux-gnu.conf /usr/lib/x86_64-linux-gnu/qtchooser/default.conf" \
          "set QT5 as default"
 
@@ -1106,7 +1156,7 @@ function qt_TrtFct () {
 #
 # MongoDB 3 CE
 #
-function mongodb_TrtFct () {
+function mongodb_PostTrtFct () {
   runCmd "sudo systemctl enable mongod.service" \
          "enabling mongod service at boot"
   runCmd "sudo systemctl start mongod.service" \
@@ -1116,7 +1166,7 @@ function mongodb_TrtFct () {
 #
 # nitrogen post install function
 #
-function nitrogen_TrtFct () {
+function nitrogen_PostTrtFct () {
   if isMate; then
     runCmd "gsettings set org.mate.background draw-background false" \
            "disabling Caja background management"