Sync up update script versions

Update nginx configuration

install/upgrade/versions/1.6.8.sh

@@ -21,6 +21,10 @@ upgrade_config_set_value 'UPGRADE_UPDATE_MAIL_TEMPLATES' 'no'
 upgrade_config_set_value 'UPGRADE_REBUILD_USERS' 'no'
 upgrade_config_set_value 'UPGRADE_UPDATE_FILEMANAGER_CONFIG' 'false'
 
+if [ -f /etc/nginx/nginx.conf ]; then 
+    sed -i "s/fastcgi_buffers                 4 256k;/fastcgi_buffers                 8 256k;/g" /etc/nginx/nginx.conf 
+fi
+
 # Sync up config files #2819
 if [ -f "/etc/roundcube/config.inc.php" ]; then
     sed -i "s/?>//" /etc/roundcube/config.inc.php