Server

Step 1. Install Xdebug

If not already ainstalled, Install Xdebug (I'ts already on the package WAML, LAMP, MAMP)

In Linux Debian/Ubuntu/Mint

# sudo apt-get install php5-xdebug

Step 1.

Check apache error log (use tail to show in real time)

# tail -f /var/log/apache2/error.log

Step 2 : 

Check MySQL database connection using mysql -uusername -ppassword

System requirements:

Database

• MySQL 5.5.3/MariaDB 5.5.20/Percona Server 5.5.8 or higher with PDO and an InnoDB-compatible primary storage engine,
• PostgreSQL 9.1.2 or higher with PDO,
• SQLite 3.6.8 or higher

Host file (Like Local DNS)

Unix /Linux : /etc/hosts

Windows : C:\WINDOWS\system32\drivers\etc\hosts

 

Example :

To disable phpmyadmin module, run followin command ad root or sudo:

sudo a2disconf phpmyadmin

sudo service apache2 reload

OR

a2disconf phpmyadmin

service apache2 reload

This is due to file/folder permission. so drupal cant write twig tempory files.

As the solution depend on your error, first of all, you must find why drupal crash.

1. First thing is, You must check the serveur error log.

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

The solution is:

ssh-keygen -R <host>

Example:

ssh-keygen -R 127.0.0.1

ssh-keygen -R domainname.com

Reson 1 : FollowSymLinks

By default, virtualmin does not support Options +FollowSymLinks (on .htaccess).

Solution 1 : Recommended