[FIXED] WordPress administrator not allowed to update or install plugins

This is just a tip, as this is not a bug, but a feature.

So if you are WordPress admin user, but you miss some menu links, especially for wordpress update, plugin install and so  – you might fear, that you have been hacked, but no – most likely in wp-config.php you have disabled file modification. Look for these lines and change from true to false.

define('DISALLOW_FILE_EDIT', false);
define('DISALLOW_FILE_MODS', false);

Enjoy!