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I had problems auto upgrade my wpmu 2.8.1 to 2.8.4a

(Ok, I am a brave man upgrading automatically! Just Lazy!)

I was getting this error:

Warning: copy(/public_html/wp-content/upgrade/wordpress-mu-2.8.4a/wordpress/wp-admin/includes/update-core.php) [function.copy]: failed to open stream: No such file or directory in /public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 131

This is how I fixed it after reading this

http://ocaoimh.ie/wordpress-mu-2-8-3/

Before upgrading, edit wp-admin/includes/class-wp-upgrader.php and look for line 697.

if ( !$wp_filesystem->copy($working_dir . ‘/wordpress/wp-admin/includes/update-core.php’, $wp_dir . ‘wp-admin/includes/update-core.php’, true) ) {

* See the “/wordpress/wp-admin/includes” bit? Change that to “/wordpress-mu/wp-admin/includes”:

if ( !$wp_filesystem->copy($working_dir . ‘/wordpress-mu/wp-admin/includes/update-core.php’, $wp_dir . ‘wp-admin/includes/update-core.php’, true) ) {

* Save the file and auto upgrade. I upgraded this afternoon without any problems after making that change.

You just have to go in and type “-mu” after “wordpress”. No need to copy and paste.