hello
when i doing a automatic uprdage
its give me
Downloading update from http://mu.wordpress.org/wordpress-mu-2.8.4a.zip.
Unpacking the update.
Could not copy file: /public_html/wp-content/upgrade/wordpress-mu-2.8.4a/wordpress-mu/wp-trackback.php
Installation Failed
Choose manual upload instead. 2.8.4 fixes the automatic upload error.
Or follow the instructions in this post: http://ocaoimh.ie/wordpress-mu-2-8-3/
I had the same issue, but followed the instructions in the link above and it worked like a charm. I was updating from 2.8.1 to 2.8.4a.