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This lunchtime I upgraded WordPress on the server to 3.1 version

I had a lot of trouble getting WP to Twitter plug-in into work out of the box. I though it was a chroot Apache problem, a missing executable, or some file permission issues with Ubuntu Linux. It was none of the above.

This was a configuration of PHP5 and CUrl module. Essentially I solved this by using Linux administration commands. Become root.

Make sure curl installed

apt-get install curl

Make sure php5-curl is installed

apt-get install php5-curl

Make sure the wordpress area is locked down with permissions

chown -R www-data:www-data /opt/wordpress

Set the permission for wordpress directory so that you as the SysAdmin can upgrade to next version

find /opt/wordpress -type d -print | xargs chmod 775

Restart the apache server with wordpress

/etc/init.d/apache2 restart

Go to the WP to Twitter settings page, perserver with the security keys. Verify that your Twitter consumer keys and my application settings are in agreement. You might have to restart Apache again. It does work. See also here.