configure xdebug ubuntu 14.04

I can't seem to get Apache 2.4 to load my xdebug configuration. I've added:

zend_extension=xdebug.so
remote_enable=on

to /etc/php5/apache2/conf.d/20-xdebug.ini.

According to phpinfo() that file does get parsed, but remote_enable is still off.

I don't see any errors in the logs. What else might I be missing?

According to xdebug manual:

xdebug.remote_enable Type: boolean, Default value: 0

This switch controls whether Xdebug should try to contact a debug client which is listening on the host and port as set with the settings xdebug.remote_host and xdebug.remote_port. If a connection can not be established the script will just continue as if this setting was 0.

I order to setup remote debugging, you should change your /etc/php5/apache2/conf.d/20-xdebug.ini and add this line:

  zend_extension=/path/to/your/xdebug.so 
  xdebug.remote_enable = 1

You should setup xdebug.remote_port and xdebug.remote_host too.

Read this link for more information on Remote Debugging