CodeIgniter 3 not working on LAMP - .htaccess

Question

I have CodeIgniter 3 running locally on MAMP just fine. But, when I pull from my repo and try to set it up on an ec2 instance with LAMP installed, I get a 404. CodeIgniter is in the /var/www/html folder
My /etc/apache2/apache2.conf file contains the following:
<Directory />
Options FollowSymLinks
AllowOverride All
</Directory>
<Directory /usr/share>
AllowOverride None
Require all granted
</Directory>
<Directory /var/www>
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Require all granted
</Directory>
mod_rewrite is enabled. The file /etc/apache2/sites-available/000-default.conf is as follows:
<VirtualHost *:80>
AccessFileName .htaccess
ServerAdmin admin#yourdomain.com
DocumentRoot /var/www/html/
<Directory />
AllowOverride All
Order allow,deny
allow from all
</Directory>
<Directory /var/www/html/>
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Order allow,deny
allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
The file /var/www/html/application/config/config.php has the following settings:
$config['index_page'] = '';
$config['base_url'] = 'http://baseurl.com';
My .htaccess file is as follows:
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Answer 1

first you check the server configuration. you can use apache error log to find server related issue.
then check error log of application.
In database.php check the
'dbdriver' => 'mysqli',
because newest Lamp not supported
'dbdriver' => 'mysql',