diff --git a/core_functions.sh b/core_functions.sh
index 4d0e98e..79b30d0 100644
--- a/core_functions.sh
+++ b/core_functions.sh
@@ -182,6 +182,15 @@ function yggInit () {
   fi
 }
 
+#
+# update kernel to the latest version
+#
+function kernelUpdate () {
+  checkAndInstallDep apt ukuu ukuu \
+  && runCmd "sudo ukuu --install-latest --yes" \
+            "installing latest kernel"
+}
+
 #
 # system update
 #TODO: add pip, npm, gem
@@ -564,6 +573,7 @@ function usage () {
   printf " "$BOLDVERT"-s"$NORMAL" : install Solaar for Logitech Unifying devices\n"
   printf " "$BOLDVERT"-t"$NORMAL" : install TLP for Laptops and low energy usage\n"
   printf " "$BOLDVERT"-n"$NORMAL" : install lastest Nvidia graphic drivers\n"
+  printf " "$BOLDVERT"-k"$NORMAL" : update system to the latest kernel\n"
   printf " "$BOLDVERT"-u"$NORMAL" : update system (apt,snap,...)\n"
   printf " "$BOLDVERT"-p"$NORMAL" : clean useless packages\n"
 	printf " "$BOLDVERT"-v"$NORMAL" : show verison number\n"
diff --git a/repo_functions.sh b/repo_functions.sh
index e8b001b..c23e030 100644
--- a/repo_functions.sh
+++ b/repo_functions.sh
@@ -462,7 +462,17 @@ telegram;addRepo_Telegram
 skypeforlinux;addRepo_SkypeForLinux
 shotwell;addRepo_Shotwell
 peek;addRepo_Peek
-sqlitebrowser;addRepo_SQLiteBrowser"
+sqlitebrowser;addRepo_SQLiteBrowser
+ukuu;addRepo_Teejee2008
+aptik;addRepo_Teejee2008
+conky-manager;addRepo_Teejee2008"
+
+#
+#
+#
+function addRepo_Teejee2008 () {
+  addPPA "teejee2008/ppa"
+}
 
 #
 # SQLiteBrowser
@@ -820,7 +830,7 @@ function addRequiredPPA () {
   addPPA "noobslab/icons" # icons from noobslab
   addPPA "numix/ppa" # theme Numix
   addPPA "ravefinity-project/ppa" # Themes
-  addPPA "teejee2008/ppa" # Aptik - Conky-Manage
+  #addPPA "teejee2008/ppa" # Aptik - Conky-Manage - Ukuu
   addPPA "yktooo/ppa" # indicator-sound-switcher
   addPPA "webupd8team/y-ppa-manager" # y-ppa-manager
   addPPA "videolan/stable-daily" # video player
diff --git a/tools_functions.sh b/tools_functions.sh
index 1e3affc..adfce03 100644
--- a/tools_functions.sh
+++ b/tools_functions.sh
@@ -14,7 +14,6 @@
 # enable ufw at boot time and add rules for installed apps
 #
 function enableUFW () {
-  msg "Enabling FireWall (UFW)"
   runCmd "sudo ufw enable"\
          "enabling UFW at boot"
 
@@ -28,13 +27,12 @@ function enableUFW () {
 # enable numlock by default on LightDM
 #
 function enableNumLockX () {
-  msg "Adding NumLockX to MDM/LightDM Default Init"
   checkAndInstallDep apt numlockx numlockx
   if which lightdm >/dev/null; then
     runCmd "sudo cp /etc/lightdm/lightdm.conf.d/70-linuxmint.conf /etc/lightdm/lightdm.conf.d/70-linuxmint.conf.yggbak" \
-           "Backing up original config file"
+           "backing up lightdm original config file"
     runCmd "echo -e '\ngreeter-setup-script=/usr/bin/numlockx on' | sudo tee -a /etc/lightdm/lightdm.conf.d/70-linuxmint.conf" \
-           "Enabling numlockx on in lightdm at boot"
+           "enabling numlockx on in lightdm at boot"
   fi
 }
 
@@ -43,7 +41,7 @@ function enableNumLockX () {
 #TODO: add possibily to choose amount of ram
 function enableTmpRAM () {
   runCmd "echo 'tmpfs /tmp tmpfs defaults,size=2g 0 0' | sudo tee -a /etc/fstab" \
-         "Enabling /tmp in RAM by modifying /etc/fstab"
+         "enabling /tmp in RAM by modifying /etc/fstab"
   if (whiptail --title "/tmp in RAM - Reboot" --yesno "Reboot required, proceed now ?" 10 60) then
     sudo reboot
   fi
@@ -53,12 +51,11 @@ function enableTmpRAM () {
 # add screenfetch exec in .bashrc
 #
 function addScreenfetchBashrc () {
-  msg "Adding screenfetch to .bashrc"
   checkAndInstallDep apt screenfetch screenfetch
   runCmd "touch /home/$myHomedir/.bashrc" \
-         "Creating .bashrc file if necessary"
+         "creating .bashrc file if necessary" \
   runCmd "echo 'screenfetch -t' | tee -a /home/$myHomedir/.bashrc" \
-         "Adding screenfetch to .bashrc"
+         "adding screenfetch to .bashrc"
 }
 
 #
@@ -66,7 +63,7 @@ function addScreenfetchBashrc () {
 #
 function enableHistoryTS () {
   typeset ret_code
-  printf "Enabling CLI History TimeStamp "
+  printf "enabling CLI History TimeStamp "
   echo "export HISTTIMEFORMAT='%F %T  '" | tee -a /home/$myHomedir/.bashrc &>> $logFile
   ret_code=$?
   retCode $ret_code
@@ -76,8 +73,7 @@ function enableHistoryTS () {
 # install/enable auto install of security updates
 #
 function installUnattendedUpgrades () {
-  msg "Installing unattended-upgrades"
-  installPackage apt "unattended-upgrades"
+  installPackage apt unattended-upgrades
 }
 
 #
@@ -128,16 +124,16 @@ function toolOptimizeFirefox () {
 #
 function toolAutoremove () {
   runCmd "sudo apt-get -y autoremove" \
-         "Removing not necessary dependencies"
+         "removing not necessary dependencies"
 }
 
 #
 # remove old versions of installed kernels
 #
 function toolClearOldKernels () {
-  checkAndInstallDep apt byobu purge-old-kernels
-  runCmd "sudo purge-old-kernels --keep 3" \
-         "Removing old kernels"
+  checkAndInstallDep apt ukuu ukuu \
+  && runCmd "sudo ukuu --purge-old-kernels --yes" \
+            "removing old kernels"
 }
 
 #
@@ -145,5 +141,5 @@ function toolClearOldKernels () {
 #
 function toolSoundCardsDetection () {
   runCmd "sudo alsa force-reload" \
-         "Detecting ALSA sound cards"
+         "detecting ALSA sound cards"
 }
\ No newline at end of file
diff --git a/yggdrasil.sh b/yggdrasil.sh
index 27552dc..1bbcbe5 100755
--- a/yggdrasil.sh
+++ b/yggdrasil.sh
@@ -50,7 +50,7 @@ echo "--[ Yggdrasil log ]--[ "$cDate" ]--[ "$cTime" ]-----------------------" >>
 #
 # arguments/options management with getopts
 
-while getopts ":h,v,f,c,u,a,d,q,s,t,n,w,p,T" option; do
+while getopts ":h,v,f,c,u,a,d,q,s,t,n,w,p,k,T" option; do
   case "$option" in
     T) #test purpose only
       yggInit
@@ -70,6 +70,7 @@ while getopts ":h,v,f,c,u,a,d,q,s,t,n,w,p,T" option; do
        #      tlp, KeyID
        # dev apps : all
        # customization : themes, icons
+       # sys : latest kernel
       msg "Initializing"
       yggInit
       msg "Updating the system"
@@ -155,6 +156,7 @@ while getopts ":h,v,f,c,u,a,d,q,s,t,n,w,p,T" option; do
       installUnattendedUpgrades
       installNitrogen
       enableUnbound
+      kernelUpdate
       msg "Installing additional themes/icons"
       installIcons
       installThemes
@@ -209,6 +211,12 @@ while getopts ":h,v,f,c,u,a,d,q,s,t,n,w,p,T" option; do
       installNvidia390
       exit
       ;;
+    k)
+      yggInit
+      updateSystem
+      kernelUpdate
+      exit
+      ;;
     u)
       yggInit
       updateSystem