Ubuntu – PhpMyAdmin mbstring is missing

Try this for your mcrypt problem:

mv -i /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/
sudo php5enmod mcrypt
sudo service apache2 restart

It's a bug with the location of the mcrypt.ini file, I got the info from here.

I had the same bug, I did a cp instead of a mv to be sure but it solved the problem.

For PHP not working, if you get phpmyadmin working (even with the mcrypt error), it means PHP is working (because phpmyadmin uses PHP). But in your example <? echo $row['details']; ?> change <? to <?php and try again?

It solved :

sudo apt-get install mysql-server
sudo dpkg-reconfigure phpmyadmin
sudo service apache2 restart