diff --git a/conf/homeserver.yaml b/conf/homeserver.yaml
index 922af14..ccc204f 100644
--- a/conf/homeserver.yaml
+++ b/conf/homeserver.yaml
@@ -197,7 +197,7 @@ thumbnail_sizes:
 # Is the preview URL API enabled?  If enabled, you *must* specify
 # an explicit url_preview_ip_range_blacklist of IPs that the spider is
 # denied from accessing.
-url_preview_enabled: False
+url_preview_enabled: True
 
 # List of IP address CIDR ranges that the URL preview spider is denied
 # from accessing.  There are no defaults: you must explicitly
@@ -207,11 +207,11 @@ url_preview_enabled: False
 # synapse to issue arbitrary GET requests to your internal services,
 # causing serious security issues.
 #
-# url_preview_ip_range_blacklist:
-# - '127.0.0.0/8'
-# - '10.0.0.0/8'
-# - '172.16.0.0/12'
-# - '192.168.0.0/16'
+url_preview_ip_range_blacklist:
+- '127.0.0.0/8'
+- '10.0.0.0/8'
+- '172.16.0.0/12'
+- '192.168.0.0/16'
 #
 # List of IP address CIDR ranges that the URL preview spider is allowed
 # to access even if they are specified in url_preview_ip_range_blacklist.
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 47562a9..12eb686 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -13,24 +13,24 @@ install_dependances() {
 	pip install --upgrade virtualenv
 }
 
-install_from_source() {
+setup_dir() {
     # Create empty dir for synapse
     mkdir -p /var/lib/matrix-synapse
     mkdir -p /var/log/matrix-synapse
     mkdir -p /etc/matrix-synapse/conf.d
     mkdir -p $final_path
+}
 
+install_source() {
     # Install synapse in virtualenv
     virtualenv -p python2.7 $final_path
     PS1=""
     cp ../conf/virtualenv_activate $final_path/bin/activate
     source $final_path/bin/activate
     pip install --upgrade pip
-    pip install --upgrade cffi
-    pip install --upgrade ndg-httpsclient
-    pip install --upgrade setuptools
-    pip install https://github.com/matrix-org/synapse/tarball/master
-    pip install psycopg2
+    pip install --upgrade cffi ndg-httpsclient setuptools
+    pip install --upgrade https://github.com/matrix-org/synapse/tarball/master
+    pip install --upgrade psycopg2 lxml
     
     # Set permission
     chown $synapse_user:root -R $final_path
@@ -127,7 +127,7 @@ set_access() { # example : set_access USER FILE
 }
 
 
-####### Solve issue 
+####### Solve issue https://dev.yunohost.org/issues/1006
 
 # Install package(s)
 #
diff --git a/scripts/install b/scripts/install
index 9647656..768b8c1 100644
--- a/scripts/install
+++ b/scripts/install
@@ -60,8 +60,9 @@ ynh_psql_create_user $synapse_db_user $synapse_db_pwd
 ynh_psql_execute_as_root \
 "CREATE DATABASE $synapse_db_name ENCODING 'UTF8' LC_COLLATE='C' LC_CTYPE='C' template=template0 OWNER $synapse_db_user;"
 
-# Create directory Install synapse in virtualenv
-install_from_source
+# Create directory and Install synapse in virtualenv
+setup_dir
+install_source
 
 # Open access to server without a button the home
 cp ../conf/add_sso_conf.py $final_path
diff --git a/scripts/upgrade b/scripts/upgrade
index 21f78f0..8e310c8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -127,11 +127,7 @@ set_certificat_access
 config_coturn
 
 # Upgrade manually Synapse
-PS1=""
-source $final_path/bin/activate
-pip install --upgrade pip
-pip install --upgrade setuptools
-pip install --upgrade https://github.com/matrix-org/synapse/tarball/master
+install_source
 
 # Set new settings
 ynh_app_setting_set $app synapse_version $synapse_version