#4 Fatal error when trying to access site

[nuromancer]

All instructions for installation completed without any problems.

Error received is:
Fatal error: Call to undefined function mysql_connect() in /var/www/inprotect/adodb/drivers/adodb-mysql.inc.php on line 357

OS: Ubuntu 6.10
Intall location: /usr/share/tools/inprotect
(website) /var/www/inprotect
perl 5.8.8-6
PHP 5.1.6-1
MySQL 5.0.24
Inprotect .22.05