The errors I saw were:
“bbPress database error: [Duplicate key name ‘user_nicename’]
ALTER TABLE wp_users ADD UNIQUE KEY user_nicename (user_nicename)
Fatal error: Maximum execution time of 600 seconds exceeded in /var/www/html/forum/bb-admin/upgrade-functions.php on line 499″
After seeing that I had a look at the WP user table to examine user_nicename. I renamed the field and reran the upgrade. This time I got the error:
“Fatal error: Maximum execution time of 600 seconds exceeded in /var/www/html/forum/bb-includes/functions.php on line 2644”.
WordPress is version 2.5.1. MySQL is “4.1.22-standard”.