diff --git a/core_functions.sh b/core_functions.sh
index f691ca1..7e7307f 100644
--- a/core_functions.sh
+++ b/core_functions.sh
@@ -111,7 +111,7 @@ function yggInit () {
   if ! grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* | grep -q ubuntu-make; then
     printf "[INIT][UMAKE] PPA not found, adding PPA...\n"
     printf "[INIT][UMAKE] PPA not found, adding PPA...\n" &>> $logFile
-    addPPA "ppa:ubuntu-desktop/ubuntu-make"
+    addPPA "ubuntu-desktop/ubuntu-make"
   else
     printf "[INIT][UMAKE] PPA found [ ""$BOLDVERT""OK"$NORMAL" ] \n"
   fi
@@ -218,11 +218,18 @@ function updateSystem () {
 #
 function addPPA () {
   typeset ret_code
-  printf "[PPA] adding : $* "
-  printf "\n[PPA] adding $*\n" &>> $logFile
-  sudo add-apt-repository -y $* &>> $logFile
-  ret_code=$?
-  retCode $ret_code
+
+  if ! grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* | grep -q $*; then
+    printf "[PPA] adding : $* "
+    printf "\n[PPA] adding $*\n" &>> $logFile
+    sudo add-apt-repository -y "ppa:"$* &>> $logFile
+    ret_code=$?
+    retCode $ret_code
+  else
+    printf "[PPA] PPA already added [ ""$BOLDVERT""OK"$NORMAL" ] \n"
+  fi
+
+
 }
 
 #
diff --git a/repo_functions.sh b/repo_functions.sh
index 3f2c759..4022c3c 100644
--- a/repo_functions.sh
+++ b/repo_functions.sh
@@ -455,14 +455,14 @@ shotwell;addRepo_Shotwell"
 # Shotwell
 #
 function addRepo_Shotwell () {
-  addPPA "ppa:yg-jensge/shotwell"
+  addPPA "yg-jensge/shotwell"
 }
 
 #
 # Telegram
 #
 function addRepo_Telegram () {
-  addPPA "ppa:atareao/telegram"
+  addPPA "atareao/telegram"
 }
 
 #
@@ -488,42 +488,42 @@ function addRepo_NodeLts8 () {
 # Kicad 4
 #
 function addRepo_Kicad () {
-  addPPA "ppa:js-reynaud/kicad-4"
+  addPPA "js-reynaud/kicad-4"
 }
 
 #
 # Brackets IDE
 #
 function addRepo_Brackets () {
-  addPPA "ppa:webupd8team/brackets"
+  addPPA "webupd8team/brackets"
 }
 
 #
 # Darktable RAW Editor
 #
 function addRepo_DarkTable () {
-  addPPA "ppa:pmjdebruijn/darktable-release"
+  addPPA "pmjdebruijn/darktable-release"
 }
 
 #
 # WireShark
 #
 function addRepo_WireShark () {
-addPPA "ppa:wireshark-dev/stable"
+addPPA "wireshark-dev/stable"
 }
 
 #
 # NextCloud
 #
 function addRepo_NextCloud () {
-  addPPA "ppa:nextcloud-devs/client"
+  addPPA "nextcloud-devs/client"
 }
 
 #
 # Atom IDE
 #
 function addRepo_Atom () {
-  addPPA "ppa:webupd8team/atom"
+  addPPA "webupd8team/atom"
 }
 
 #
@@ -613,7 +613,7 @@ function addRepo_Etcher () {
 # Ansible
 #
 function addRepo_Ansible () {
-  addPPA "ppa:ansible/ansible"
+  addPPA "ansible/ansible"
 }
 
 #
@@ -656,21 +656,21 @@ function addRepo_Wine () {
 # LibreOffice 6
 #
 function addRepo_Libreoffice6 () {
-  addPPA "ppa:libreoffice/ppa"
+  addPPA "libreoffice/ppa"
 }
 
 #
 # Kodi (Beta)
 #
 function addRepo_KodiBeta () {
-  addPPA "ppa:team-xbmc/unstable"
+  addPPA "team-xbmc/unstable"
 }
 
 #
 # Kodi (Nightly)
 #
 function addRepo_KodiNightly () {
-  addPPA "ppa:team-xbmc/xbmc-nightly"
+  addPPA "team-xbmc/xbmc-nightly"
 }
 
 #
@@ -686,7 +686,7 @@ function addRepo_VSCode () {
 # Android-Studio
 #
 function addRepo_AndroidStudio () {
-  addPPA "ppa:maarten-fonville/android-studio"
+  addPPA "maarten-fonville/android-studio"
 }
 
 #-----------------------------------------------------------------------------#
@@ -795,50 +795,50 @@ function addRequiredPPA () {
   runCmd "echo sience-config science-config/group select '$myHomedir ($myHomedir)' | sudo debconf-set-selections" \
          "apply settings for science-config pkg"
 
-  addPPA "ppa:noobslab/themes" # themes from noobslab
-  addPPA "ppa:noobslab/icons" # icons from noobslab
-  addPPA "ppa:numix/ppa" # theme Numix
-  addPPA "ppa:ravefinity-project/ppa" # Themes
-  addPPA "ppa:teejee2008/ppa" # Aptik - Conky-Manage
-  addPPA "ppa:yktooo/ppa" # indicator-sound-switcher
-  addPPA "ppa:webupd8team/y-ppa-manager" # y-ppa-manager
-  addPPA "ppa:videolan/stable-daily" # video player
-  addPPA "ppa:nowrep/qupzilla" # web browser
-  addPPA "ppa:atareao/atareao" # pushbullet-indicator, imagedownloader, gqrcode, cpu-g
-  addPPA "ppa:fossfreedom/rhythmbox-plugins";  # Rhythmbox plugins
-  addPPA "ppa:fossfreedom/rhythmbox" # Rhythmbox
-  addPPA "ppa:nilarimogard/webupd8" # Audacious, Grive2, Pidgin-indicator
-  addPPA "ppa:oibaf/graphics-drivers" # free graphics-drivers + mesa
-  addPPA "ppa:team-xbmc/ppa" # Kodi
-  addPPA "ppa:webupd8team/java" # Oracle Java SE 7/8
-  addPPA "ppa:hugin/hugin-builds" # image editor
-  addPPA "ppa:mumble/release" # Mumble
-  addPPA "ppa:atareao/utext" # Markdown editor
-  addPPA "ppa:danielrichter2007/grub-customizer" # grub-customizer
-  addPPA "ppa:lucioc/sayonara" # audio player
-  addPPA "ppa:haraldhv/shotcut" # video editor
-  addPPA "ppa:flacon/ppa" # audio extraction
-  addPPA "ppa:jaap.karssenberg/zim" # local wiki
-  addPPA "ppa:stebbins/handbrake-releases" # video transcoder
-  addPPA "ppa:graphics-drivers/ppa" # non-free nvidia drivers
-  addPPA "ppa:diodon-team/stable" # clipboard manager
-  addPPA "ppa:notepadqq-team/notepadqq" # notepad++ clone
-  addPPA "ppa:mariospr/frogr" # flickr manager
-  addPPA "ppa:ubuntuhandbook1/slowmovideo" # slow motion video editor
-  addPPA "ppa:transmissionbt/ppa" # bittorrent client
-  addPPA "ppa:geary-team/releases" # email client
-  addPPA "ppa:ubuntuhandbook1/corebird" # corebird
-  addPPA "ppa:tista/adapta" # adapta gtk theme
-  addPPA "ppa:maarten-baert/simplescreenrecorder" # simplescreenrecorder
-  addPPA "ppa:dhor/myway" # rawtherapee (newer version)
-  addPPA "ppa:zeal-developers/ppa" # Zeal (newer version)
-  addPPA "ppa:deluge-team/ppa" # Deluge P2P client
-  addPPA "ppa:kritalime/ppa" # Krita
-  addPPA "ppa:otto-kesselgulasch/gimp" # Gmic2
-  addPPA "ppa:ozmartian/apps" # Vidcutter
-  addPPA "ppa:fossproject/ppa" # green-recorder
-  addPPA "ppa:quiterss/quiterss" # quiterss
-  addPPA "ppa:tmsu/ppa" # tmsu
+  addPPA "noobslab/themes" # themes from noobslab
+  addPPA "noobslab/icons" # icons from noobslab
+  addPPA "numix/ppa" # theme Numix
+  addPPA "ravefinity-project/ppa" # Themes
+  addPPA "teejee2008/ppa" # Aptik - Conky-Manage
+  addPPA "yktooo/ppa" # indicator-sound-switcher
+  addPPA "webupd8team/y-ppa-manager" # y-ppa-manager
+  addPPA "videolan/stable-daily" # video player
+  addPPA "nowrep/qupzilla" # web browser
+  addPPA "atareao/atareao" # pushbullet-indicator, imagedownloader, gqrcode, cpu-g
+  addPPA "fossfreedom/rhythmbox-plugins";  # Rhythmbox plugins
+  addPPA "fossfreedom/rhythmbox" # Rhythmbox
+  addPPA "nilarimogard/webupd8" # Audacious, Grive2, Pidgin-indicator
+  addPPA "oibaf/graphics-drivers" # free graphics-drivers + mesa
+  addPPA "team-xbmc/ppa" # Kodi
+  addPPA "webupd8team/java" # Oracle Java SE 7/8
+  addPPA "hugin/hugin-builds" # image editor
+  addPPA "mumble/release" # Mumble
+  addPPA "atareao/utext" # Markdown editor
+  addPPA "danielrichter2007/grub-customizer" # grub-customizer
+  addPPA "lucioc/sayonara" # audio player
+  addPPA "haraldhv/shotcut" # video editor
+  addPPA "flacon/ppa" # audio extraction
+  addPPA "jaap.karssenberg/zim" # local wiki
+  addPPA "stebbins/handbrake-releases" # video transcoder
+  addPPA "graphics-drivers/ppa" # non-free nvidia drivers
+  addPPA "diodon-team/stable" # clipboard manager
+  addPPA "notepadqq-team/notepadqq" # notepad++ clone
+  addPPA "mariospr/frogr" # flickr manager
+  addPPA "ubuntuhandbook1/slowmovideo" # slow motion video editor
+  addPPA "transmissionbt/ppa" # bittorrent client
+  addPPA "geary-team/releases" # email client
+  addPPA "ubuntuhandbook1/corebird" # corebird
+  addPPA "tista/adapta" # adapta gtk theme
+  addPPA "maarten-baert/simplescreenrecorder" # simplescreenrecorder
+  addPPA "dhor/myway" # rawtherapee (newer version)
+  addPPA "zeal-developers/ppa" # Zeal (newer version)
+  addPPA "deluge-team/ppa" # Deluge P2P client
+  addPPA "kritalime/ppa" # Krita
+  addPPA "otto-kesselgulasch/gimp" # Gmic2
+  addPPA "ozmartian/apps" # Vidcutter
+  addPPA "fossproject/ppa" # green-recorder
+  addPPA "quiterss/quiterss" # quiterss
+  addPPA "tmsu/ppa" # tmsu
 
   addKey "https://mkvtoolnix.download/gpg-pub-moritzbunkus.txt"
   addRepo mkv.list \
diff --git a/yggdrasil.sh b/yggdrasil.sh
index 3e0212d..c003e4a 100755
--- a/yggdrasil.sh
+++ b/yggdrasil.sh
@@ -43,14 +43,14 @@ echo "--[ Yggdrasil log ]--[ "$cDate" ]--[ "$cTime" ]-----------------------" >>
 while getopts ":h,v,f,c,t,u" option; do
   case "$option" in
     t) #test purpose only
-      yggInit
+      #yggInit
       #installIdea
       #installNetTools
       #installOffice
+      #addPPA "tmsu/ppa"
       exit
       ;;
     f) # install all apps
-      #TODO:
       yggInit
       updateSystem
       addRequiredPPA
@@ -76,8 +76,9 @@ while getopts ":h,v,f,c,t,u" option; do
       exit
       ;;
     c) # install themes and icons
-      #TODO:
       yggInit
+      updateSystem
+      addRequiredPPA
       installIcons
       installThemes
       exit