Why would you want to point your browser to /usr/share/phpgroupware/index.php? You should not even have to link /usr/share/phpgroupware to /var/www/phpgroupware. It is included in /etc/apache/httpd.conf through /etc/apache/conf.d/phpgroupware.conf.
Go to
Code:
http://localhost/phpgroupware/setup
to configure phpgroupware.
Look at
Code:
http://localhost/phpgroupware/doc/en_US/html/admin/
for help.