problem installing moodle via synaptic

Trying to install MOODLE using synaptic, but it does not work.

In short, it seems that moodle is installed on /usr/share/moodle, but apache serves files on /var/www/html.

Long description of my test:

- installed ubuntu 15.04 amd64 in a virtualized virtualbox machine (language: brazillian portuguese);
- installed all updates;
- installed synaptic;
- installed MYSQL server (using synaptic);
- installed moodle (using synaptic):
    - warning about libphp-adodb:
            "the lib is not installed under /usr/share/adodb anymore.
            New path is /usr/share/php/adodb. Please update file php.ini.
            May be necessary to change web server configuration"
    - setting url for moodle site: http://localhost/moodle
    - "config moodle database with dbconfig-common?": YES
    - database type: choose MYSQL
    - setting passwords for moodle, mysql ...

- tested apache installation using: http://localhost - OK

- tested moodle: http://localhost/moodle: NOT FOUND

Thanks in advance for any help.
Best regards!
Carlos