It works, thanks.
For those who may pass by :
on putty, connect to your server (or on the prompt of your server)
(i use vim, but cat or nano are the same)
sudo vim /var/www/html/moodle/config.php
line 21 : $CFG->wwwroot = 'http://192.168.0.152/moodle';
rewrite into
$CFG->wwwroot = 'http://yoursite/moodle';
and it works perfectly.