Installing Drupal

Dear all,
I used quiz module and Organic groups module to create and control access quiz. I was created a quiz1 and setup for anonymous user can access to quiz. So, I can't see start quiz when I access website as anonymous user.
1. How to config access quiz and take quiz in each quiz node?
2. How to increase Allowed number of attempts for a quiz?
3. When a user is locked by exceeded number of attempts. How to unlock for that user?

Please help me.
Thank you so much,

Hello everybody,
When I install used Organic groups context module. My website display a notice as below.
Notice: Trying to get property of non-object in og_context() (line 232 of sites/all/modules/og/og_context/og_context.module).

Please help me how to fix it?

Thank you so much,
Bien Hoang

I am trying to install Drupal 8.0.5 on Apache 2.4.6 on CentOS 7, with PHP 5.6.19. But in the web GUI for finalizing the Drupal installation, I get a problem on the requirements page. It says "PHP extensions disabled. Drupal requires you to enable the PHP extensions in the following list... gd"

I have installed, with yum install these packages: gd, gd-devel, php-gd, php-pdo php-mbstring, php-xml.

I'm trying to install Drupal 8 on my server (PHP 5.6).
Copied the file, extracted and when I access the site URL it displays the following error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

I have done numerous installation of Drupal 6 & 7 before and this is the 1st time I have this issue. Even tried different D8 versions.
Followed the requirements on this link: https://www.drupal.org/requirements

I have installed Virtual Machine with Drupal on Azure.

When I open it's static IP address, it shows me Welcome to user's Site page.

When I access to my VM via FTP there are multiple folders in /opt/bitnami/apps:

1. bitnami
2. drupal
3. phpmyadmin

My boss gave me backup for drupal site which are compressed in tar.gz file:

1. website source
2. sql file

Website source file has code folder which contains a lot of other folders, images and php files.

Is there a SaltStack .sls file, Puppet manifest, or Ansible play-book to install Drupal? I'm interested in full installations without using the web-based configuration tool. Is it possible to not use the GUI and install Drupal?