The php mcrypt extension on ubuntu 14.04 shows that it is installed properly, but phpmyadmin says:

 The mcrypt extension is missing. Please check your PHP configuration.

My current php config is here. If you need anymore information, please contact me through the comments.

$ sudo apt-get install php5-mcrypt
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    php5-mcrypt is already the newest version.
    0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  • 7
    The accepted answer is not best practice. The simplest, and correct answer: http://askubuntu.com/a/477608/139249 also has the most votes. – mike stewart Feb 3 '15 at 18:02
  • For others' reference, the "simplest" answer did not work for me. php5enmod mcrypt froze up Apache. php5dismod mcrypt freed it up again. I went with the accepted answer and modified the path for extension=.. and this time php5enmod mcrypt worked. So yes, it's comprehensive and should be the accepted answer. – Oliver Williams Jan 26 '17 at 23:35

14 Answers 14


Try this:

sudo updatedb 
locate mcrypt.ini

Should show it located at /etc/php5/mods-available

locate mcrypt.so

Edit mcrypt.ini and change extension to match the path to mcrypt.so, example:


Now this:

sudo php5enmod mcrypt - (optional since its already enabled during phpmyadmin setup)

Verify that new files exists here (they should be auto created from the issue above)

ls -al /etc/php5/cli/conf.d/20-mcrypt.ini
ls -al /etc/php5/apache2/conf.d/20-mcrypt.ini

Otherwise do the following

Create symbol links now

sudo ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/cli/conf.d/20-mcrypt.ini
sudo ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/apache2/conf.d/20-mcrypt.ini

Restart Apache

sudo service apache2 restart

Restart php5 or php5-fpm

sudo service php5 restart
  • This is wrong! I think you meant something like: sudo ln -s /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/mcrypt.ini And not the other way around. – AturSams Sep 3 '14 at 14:22
  • 14
    Doing just php5enmod mcrypt worked smoothly for me. – Diosney Jan 6 '15 at 21:44
  • 3
    Running php5enmod mcrypt will create those symbolic links for you. No need to do that manually (i.e. you can skip the ln -s commands). – Serrano Pereira Jan 16 '15 at 21:15
  • 1
    running php5enmod mcrypt is the correct Ubuntu/Debian way. This answer though will work, is cumbersome and not a best practice. – mike stewart Feb 3 '15 at 17:45
  • 1
    many steps of above are not necessary. See @MURATSPLAT's answer. – Raptor Oct 15 '15 at 9:29

Try just doing this:

sudo php5enmod mcrypt

And then:

sudo service apache2 restart 

I have installed fresh Ubuntu 14.04 (desktop version) to my computer. This way works for enabling mcrypt that was already installed.

  • 5
    Note, if you're running nginx with php5-fpm -- then php5-fpm service restart (or reload if it's finally patched) – mike stewart Feb 3 '15 at 17:54
  • 2
    What those two command do is this: the 1st line is enabling module named 'mcrypt', and then restart apache2 to update the config. You can see the enabled module from /etc/apache2/mods-available. Enjoy LAMP life :) – kenju Oct 21 '15 at 9:57
  • sudo service apache2 reload is enough, no actual restart is needed (on 14.04 anyway, that's what I tried it on) – Jasper Jan 10 '16 at 16:42

Install mcrypt extension for PHP, Enable it, and Restart Apache. Following are the commands to do:

sudo apt-get install mcrypt php5-mcrypt
sudo php5enmod mcrypt
sudo service apache2 restart
  • 1
    Simple. Perfect. Works without issues, at least for me on Ubuntu 14.04.1 LTS (trusty) – Gor Dec 19 '14 at 20:15
  • It's working on ubuntu 14.10 too – Coca Akat Apr 21 '15 at 9:12
  • I would recommend you don't include mcrypt in your first line. It is implicitly installed as a dependency of php5-mcrypt, but if you explicitly install it apt-get won't know to remove it if you later choose to un-install the ph5-mcrypt package. – beldaz Sep 17 '15 at 20:39
  • @beldaz there is at least one server where php5-mcrypt was installed as per apt-get but mcrypt was missing because of which pnp module was not getting enabled leading to joomla installation issue. so including mcrypt makes sense for me. – tagMacher Sep 21 '16 at 8:27

The php5-mcrypt Ubuntu package install the config file mcrypt.ini into /etc/php5/conf.d/ which is the old PHP config directory layout.

The current way of working to enable modules in PHP5 is to put the ini files in the /etc/php5/mods-available directory. Then, to enable the module in PHP5, you have to create a symbolic link to the related ini files from /etc/php5/apache2/conf.d directory to enable the module when PHP is used under Apache or / and from /etc/php5/cli/conf.d if you want to have this module enabled when you use PHP outside Apache, in scripts run at the command line or from crontab.

Also note that in the conf.d directory, you can create the link to the ini file by putting a number in front of it to have the modules loaded in a specific order. Usefull when you need to load a module depending on another one.

Of course, don't forget to restart Apache if you have enabled the module for Apache :

 sudo service apache2 restart

My 14.04 server install only needed (after php5-mcrypt installed)

sudo php5enmod mcrypt
sudo service apache2 restart

If the Problem still occurs,

enable the module by adding: extension=mcrypt.so to




  • 1
    For me adding the 'extension=mcrypt.so' worked after installing the mcrypt. Lubuntu 14.04 Trusty Thar – Clain Dsilva Apr 23 '15 at 4:35
  • This works and is WAY simpler then the accepted answer... which will also break when it updates. – Eric Dec 11 '15 at 18:32
  • I followed every instruction here and in other places but in vain. ubuntu 14.04.3 -- PHP 5.5.9-1ubuntu4.14 -- nginx/1.8.1 -- Server version: 5.7.10 - MySQL -- Database client version: libmysql - 5.5.47 -- phpMyAdmin Version: 4.0.10deb1....anyone have an idea? – Jadeye Feb 2 '16 at 9:21

In Ubuntu 16.04 LTS, to enable the mcrypt module, with php 5.6:

sudo apt-get install mcrypt
sudo apt-get install php5.6-mcrypt
sudo phpenmod mcrypt

or with php 7.0:

sudo apt-get install mcrypt
sudo apt-get install php7.0-mcrypt
sudo phpenmod mcrypt

and then

sudo service apache2 restart

With PHP 7

sudo apt-get install php-mcrypt
sudo phpenmod mcrypt
sudo /etc/init.d/apache2 restart
  • $ sudo phpenmod mcrypt WARNING: Module mcrypt ini file doesn't exist under /etc/php/7.1/mods-available – Yevgeniy Afanasyev Dec 15 '16 at 1:56
  • $ sudo /etc/init.d/apache2 restart sudo: /etc/init.d/apache2: command not found – Yevgeniy Afanasyev Dec 15 '16 at 1:57

You should be able to install the mcrypt extension for PHP by running:

sudo apt-get install php5-mcrypt
  • well, it says that it (command line) is installed properly, but it is somehow missing from the server as mentioned above – matthapkidokarate May 5 '14 at 0:06
  • 1
    @jkt123: I've noticed that when you install some php module like php5-mcrypt in Ubuntu, all the files are there afterward but the module is not enabled in the main PHP config. You have to activate it manually like described in the accepted answer. – Benoit Jun 6 '14 at 12:19
  • it does not work without adding the extension=mcrypt.so to php.ini – Eric Dec 11 '15 at 18:30

Note that in Ubuntu 14.04 the php5-mcrypt is in the universe repository that could be disabled. In this case to install it you must enable the repository with:

sudo add-apt-repository universe

You need to enable the mcrypt module:

sudo php5enmod mcrypt
sudo service apache2 restart

This is the best way to add php 5.5 mcrypt extension on Ubuntu 14.04 Server

sudo apt-get install php5-mcrypt
sudo ln -s /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available
sudo php5enmod mcrypt 
sudo service apache2 restart

@Kevsin's answer worked for me, but I had to run mkdir -p /etc/php5/apache2/conf.d/ and manually run the sudo ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/apache2/conf.d/20-mcrypt.ini to get to work. sudo php5enmod mcrypt worked fine for the first symlink.

Note: I'm running PHP5-FPM. That may have been the difference.


For those who find this, for Ubuntu 16.04 (using PHP7), here is what I did to enable mcrypt:

sudo apt-get install mcrypt php-mcrypt
sudo phpenmod mcrypt
sudo service apache2 restart

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