diff --git a/scripts/_common.sh b/scripts/_common.sh
index d1c3a0e..d387b1b 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -16,19 +16,19 @@ APP_VERSION=$(get_app_version_from_json)
 
 install_dependances() {
 	ynh_install_app_dependencies rrdtool perl libwww-perl libmailtools-perl libmime-lite-perl librrds-perl libdbi-perl libxml-simple-perl libhttp-server-simple-perl libconfig-general-perl pflogsumm
-	ynh_package_update
-	dpkg -i /tmp/monitorix.deb
-	ynh_secure_remove /etc/monitorix/conf.d/00-debian.conf
-	ynh_package_install -f
 }
 
-get_source() {
+get_install_source() {
     wget -q -O '/tmp/monitorix.deb' "http://www.monitorix.org/monitorix_${APP_VERSION}-izzy1_all.deb"
 
     if [[ ! -e '/tmp/monitorix.deb' ]] || [[ $(sha256sum '/tmp/monitorix.deb' | cut -d' ' -f1) != $sha256sum ]]
     then
         ynh_die "Error : can't get monitorix debian package"
     fi
+	ynh_package_update
+	dpkg --force-confdef --force-confold -i /tmp/monitorix.deb
+	ynh_secure_remove /etc/monitorix/conf.d/00-debian.conf
+	ynh_package_install -f
 }
 
 config_nginx() {
diff --git a/scripts/install b/scripts/install
index d492f46..3cdf28a 100755
--- a/scripts/install
+++ b/scripts/install
@@ -17,12 +17,12 @@ path=$(ynh_normalize_url_path $YNH_APP_ARG_PATH)
 test $(ynh_webpath_available $domain $path) == 'True' || ynh_die "$domain$path is not available, please use an other domain or path."
 ynh_webpath_register $app $domain $path
 
-# Download package
-get_source
-
 # Install package    
 install_dependances
 
+# Download package and install it
+get_install_source
+
 # # Generate MySQL user
 dbuser=$app
 dbpass=$(ynh_string_random 12)
diff --git a/scripts/restore b/scripts/restore
index 24173df..c396654 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -16,12 +16,12 @@ path=$(ynh_normalize_url_path $(ynh_app_setting_get "$app" path))
 # Check domain/path availability
 ynh_webpath_available $domain $path || ynh_die "$domain/$path is not available, please use an other domain or path."
 
-# Download package
-get_source
-
 # Install package    
 install_dependances
 
+# Download package and install it
+get_install_source
+
 # Create user for database
 dbuser=$app
 dbpass=$(ynh_app_setting_get "$app" mysqlpwd)
diff --git a/scripts/upgrade b/scripts/upgrade
index b06d5f8..af90ff9 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -18,12 +18,8 @@ dbuser=$app
 dbname=$app
 dbpass=$(ynh_app_setting_get "$app" mysqlpwd)
 
-# Download package
-get_source
-
-# Update package    
-dpkg -i /tmp/monitorix.deb
-ynh_secure_remove /etc/monitorix/conf.d/00-debian.conf
+# Download package and install it
+get_install_source
 
 # Update nginx config
 config_nginx