Install halts at "Installing Drupal"

When performing a Drupal 6.1 install, the install halts at the "Install Site" step. The page is fully themed, but its only content is the page title: "Installing Drupal".

The URL in the address bar is http://www.hyperlogos.org:8080/install.php?locale=en&profile=default&op=start&id=1

As you can see I am not using port 80.

The database seems to be populated (at least partially?) and sites/default/settings.php created.

If I visit http://www.hyperlogos.org:8080/ I get:

Fatal error: Call to undefined function user_access() in /var/www/drupal6/includes/theme.inc on line 1671

I see this is in the system module 'user.module'...

# uname -a
Linux agamemnon 2.6.22-14-generic #1 SMP Tue Feb 12 07:42:25 UTC 2008 i686 GNU/Linux
# /usr/sbin/apache2 -v
Server version: Apache/2.2.4 (Ubuntu)
Server built:   Feb  4 2008 20:30:42
# php -v
PHP 5.2.3-1ubuntu6.3 (cli) (built: Jan 10 2008 09:38:37) 
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies

Drupal (6.1) is in /var/www/drupal6.