title: Ubuntu 20.04, PHP 7.4: mbstring installed but not enabled
body: <p>I'm running Ubuntu 20.04, and using PHP 7.4.</p>
  <p>During a phpBB installation, it was reported &quot;In order for phpBB to function correctly, the PHP mbstring extension needs to be available.&quot;  I was able to install it; <code>sudo apt list | grep mbstring</code> reports <code>php7.4-mbstring/focal,now 7.4.20-1+ubuntu20.04.1+deb.sury.org+1 amd64 [residual-config]</code>.</p>
  <p>However, <code>phpinfo.php</code> reports <code>Multibyte decoding support using mbstring   disabled</code> in the <code>exif</code> section.  <code>phpinfo.php</code> also reports <code>Loaded Configuration File /etc/php/7.4/apache2/php.ini</code>.</p>
  <p>I edited this .ini file to uncomment <code>;extension=mbstring</code> in the Dynamic Extensions section, and restarted apache.  However, <code>phpinfo.php</code> still reports the extension is diabled.  I even rebooted the server, to no avail.  What am I missing?</p>