WordPress 3.0.1 Auto Update Problem

My WordPress now is at version 2.7. I want to upgrade it to 3.0.1 using Auto update function. I’m using FTPS connection type.

The upgrade should be straight forward, however, I keep on encountering this error:

Installation Failed
Downloading update from
http://wordpress.org/wordpress-3.0.1.zip…

Unpacking the update…

Verifying the unpacked files…

Installing the latest version…

Could not copy file.:
/wp-admin/css/theme-editor.dev.css

Installation Failed

I’ve checked the permission for the /wp-admin/css folder, and it’s set to 777.

What is the problem? I’ve searched the internet, but it seems that a lot of people has the same problem.

Any ideas?

Auto update doesn’t always work, it almost always works. I’d just upgrade manually and not worry about it. The few times I’ve had an auto update failure it succeeds the next time a new version comes out (after I’m manually updated during the breakage).