Topic on Extension talk:CheckUser

I've added the following code to the LocalSettings.php file:

wfLoadExtension( 'CheckUser' );

But yet, the checkuser extension is not being installed!

What can I do?

If that does not try if you are running nginx I would recommend clearing your php-fpm. As well as sometimes it hasn't cleared the cache for it.

you need to run update.php to generate the sql tables