diff --git a/scripts/_common.sh b/scripts/_common.sh
index a0d2a8c..51dac8e 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -7,7 +7,9 @@
 # dependencies used by the app
 pkg_dependencies="python3-pip libffi-dev"
 
-nodejs_version=10
+nodejs_version="10"
+
+jupyterlab_version="2.1.1"
 
 #=================================================
 # PERSONAL HELPERS
diff --git a/scripts/install b/scripts/install
index 6c7b420..56447ad 100644
--- a/scripts/install
+++ b/scripts/install
@@ -93,8 +93,6 @@ ynh_script_progression --message="Setting up source files..." --weight=64
 
 ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 
-source ./upgrade.d/upgrade.sh
-
 mkdir -p $final_path
 
 pushd $final_path
@@ -160,8 +158,8 @@ ynh_store_file_checksum --file="$final_path/config/jupyter_notebook_config.py"
 #=================================================
 
 # Set permissions to app files
-chown -R root: $final_path
-chown -R $admin: $final_path/.venv
+chown -R root: $final_path/
+chown -R $admin: $final_path/.venv/
 
 #=================================================
 # ADVERTISE SERVICE IN ADMIN PANEL
diff --git a/scripts/restore b/scripts/restore
index 49afef2..38823a0 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -62,8 +62,8 @@ ynh_restore_file --origin_path="$final_path"
 #=================================================
 
 # Restore permissions on app files
-chown -R root: $final_path
-chown -R $admin: $final_path/.venv
+chown -R root: $final_path/
+chown -R $admin: $final_path/.venv/
 
 #=================================================
 # SPECIFIC RESTORATION
diff --git a/scripts/upgrade b/scripts/upgrade
index b1abbbe..862539d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -110,8 +110,6 @@ then
 	ynh_script_progression --message="Upgrading source files..." --weight=160
 
 	# Download, check integrity, uncompress and patch the source from app.src
-	source ./upgrade.d/upgrade.sh
-
 	mkdir -p $final_path
 
 	pushd $final_path
@@ -170,8 +168,8 @@ ynh_add_systemd_config
 #=================================================
 
 # Set permissions on app files
-chown -R root: $final_path
-chown -R $admin: $final_path/.venv
+chown -R root: $final_path/
+chown -R $admin: $final_path/.venv/
 
 #=================================================
 # SETUP SSOWAT
diff --git a/scripts/upgrade.d/upgrade.sh b/scripts/upgrade.d/upgrade.sh
deleted file mode 100644
index 4f92d7d..0000000
--- a/scripts/upgrade.d/upgrade.sh
+++ /dev/null
@@ -1 +0,0 @@
-jupyterlab_version="2.1.1"