Hi,  I don't find the default module to add all links neither the widget links of wordpress. There are "Pages, News, Portfolios, Clients, etc..." but not Links. Could you help me to retrieve this default module? Sorry for my bad English... 

Thank you very much.

So, it's ok, I found it. 

add_filter( 'pre_option_link_manager_enabled', '__return_true' );// links