Worpdress Upgrade/Installation failed while trying to upgrade this site to WordPress 3.3.1
Downloading update from http://wordpress.org/wordpress-3.3.1-no-content.zip…
Unpacking the update…
Verifying the unpacked files…
Installing the latest version…
Could not copy file.: /public_html/index.php
Installation Failed
Folder/File Permissions
Typical wordpress upgrade failure from within wordpress Automatic updates are related to file/folder permissions.
Reference Article – Changing File Permissions in WordPress
Problem
wp-content folder owner was set to nobody
wp-content/upload owner was set to the FTP User.
I believe all the folder and files needs to have same ownership.
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