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The supposed permission problem has occured before and mainly involves plugins. For older version of wordpress, your problem may be solved by one or both of the

• Change of table prefix - I suggest you visit this to solve that problem. And it also solves a string of other things, too.
• Failed Upgrade - If you used an automatic upgrade and failed, it is possible that the version number saved in the database is already updated. You can force upgrade it by updating the your version number. Another alternative is by using MarkAquit’s script here

However, these solutions are only applicable for older versions of WordPress. If you have a clean install, you should not encounter this. That’s why it didn’t work and was back to square one of investigation. Upon further checking, it turned out that the problem is related to old plugins. Apparently, there are plugins that was written before the current releases and whose parts of the code is no longer compliant with the current version of WordPress.

Finding the offending plugin is a bit tricky especially if you are using a lot of plugins. Luckily, I only encounter this in a contact page plugin and replace it accordingly with a new plugin which was released lately. The problem with my older plugin is that there’s no more active development. And so when some of the codes were deprecated, the plugin fails.

So what’s the problem then? Old Plugins.

Single Table

RENAME TABLE wp_users TO kwg_users;


multiple tables

RENAME TABLE wp_users TO kwtg_users,
wp_usermeta TO kwtg_usermeta,
wp_site TO kwtg_wpsite,
wp_signups TO kwtg_signups;


This is handy when renaming a whole lot of tables as in the case of WordPress mu where each blog has its own set of tables. If you decide to rename them for security reasons (like you forgot to change the default table prefix during installation), it will be a pain to change them one by one through phpMyAdmin.


UPDATE bb_meta
SET meta_value = 'wpmu_'
WHERE meta_key = 'wp_table_prefix';


That’s of course considering your bbPress table is bb_meta and the new prefix for WordPress/WordPress mu is wpmu.

1. Login to your server via FTP
2. navigate to wp-contents folder
3. rename the existing upgrade folder to a new name(you can also choose to delete)
4. under wp-contents folder, create a new folder named upgrade
5. set permission of the new upgrade folder to 666
6. re-run the upgrade from within wordpress

The one thing that I noticed in this problem is the fact that it only happens on my WordPress installations on VPS. All other sites sitting on a shared cpanel-powered hosting do not encounter this. So there must be something wrong with my VPS configuration.

I’ll need to find that out because there’s still one annoying step that needs to be done before upgrading a WP installation. If you have over a dozen sites to update and they are sitting on different servers, it becomes an issue. A one-click solution would be most welcome.

Do you have any idea how I would be able to solve this?