Follow the instructions at /usr/share/doc/${PF}/INSTALL
to complete the install.  You need to add MySQL users
and configure group-office 

Before installing/configure you have to

touch /var/www/localhost/htdocs/groupoffice/config.php
chmod 0777 /var/www/localhost/htdocs/groupoffice/config.php
mkdir /var/www/localhost/htdocs/groupoffice/local/
chown apache:apache /var/www/localhost/htdocs/groupoffice/local/
chmod 644 /var/www/localhost/htdocs/groupoffice/config.php
rm -Rf /var/www/localhost/htdocs/groupoffice/install/


After that, make groupoffice secure again
chmod 644 /var/www/localhost/htdocs/groupoffice/config.php
and
rm -Rf /var/www/localhost/htdocs/groupoffice/install/