Installing and upgrading help

I would see if using PHP 5.6 causes the problem to go away.

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install -y php5.6

Also add the relevant PHP extensions: http://docs.moodle.org/31/en/PHP#PHP_Extensions_and_libraries

Then change from PHP 7 to 5.6 (reverse commands 1 and 2 to revert later)

sudo a2dismod php7
sudo a2enmod php5.6
sudo service apache2 restart

Also, I vaguely remember you wanting to create a replica of your production environment.

If you are doing this to plan for a prod 14.04 > 16.04 upgrade, be warned that there is a period during this upgrade where Apache could be executed without PHP mod enabled, meaning entire webroot directory is visible to the world (including config.php). If you don't want that public, move config.php out of the directory or even better, disconnect server from internet or clean install 16.04

Check for errors in the error.log of your apache web server

It is usually located at /var/log/apache2/error.log

The easiest way to do it is to open a terminal and type

tail -f /var/log/apache2/error.log

Leave this terminal window open and try to login to your moodle site. New errors will appear in your terminal window

Hi

1) You need to go to the Moodle directory server/moodle/admin/ and open index.php file.

2) Comment this line at line no: 694 "redirect("index.php?sessionstarted=1&lang=$CFG->lang");"

3) Save the file and close.

Hi

After working fine than you can uncomment this line.