Max file upload definitive answer needed

I have looked through various forum postings but still can’t crack this one. Any help appreciated!

I have installed WP latest version on Ubuntu 10 with latest LAMP installed using apt-get, ona local machine. This server runs on a local network. All works fine. But I need to increase the file upload size. I tried all of the below in vain, it doggedly retains 2M maximum.
– Looked for php.ini (using locate… it did not exist, only php.ini-production and -development in the /usr/share/php5 folder)
– Therefore, coped /usr/share/php5/php.ini-production to create php.ini in same folder, and then
– Changed the variables max file size and max post size to 64M
– Still no effect, it says 2M max (after restart)

– Tried adding to /var/www/wordpress/wp-config.php
define(‘WP_MEMORY_LIMIT’, ‘64M’);
– Still no effect

– Added same line to wp-settings.php
– Still no effect

– Created a php.ini file with the exact code below and saved it in
/var/www/wordpress
AND
/var/www/wordpress/wp-admin
– still no effect

[PHP]
post_max_size 64M
upload_max_filesize = 64M