Apache mod_rewrite doesn't work - php

Question

I want use mod_rewrite but seems that is not working, I activated it and I setup in my .htaccess but nothing seems to work.
I want to NOT display index.php in my URL :
instead of
localhost/index.php/admin/login
I want to display
localhost/admin/login
I am under Ubuntu
Here is what my phpinfo() says :
This is my .htaccess :
# Make sure directory listing is disabled
Options +FollowSymLinks -Indexes
RewriteEngine on
#RewriteBase /virtualpost
RewriteCond %{HTTP_HOST} ^localhost$
RewriteRule . - [E=REWRITEBASE:/virtualpost]
#RewriteBase /
RewriteCond %{HTTP_HOST} ^((?!localhost).)*$
RewriteRule . - [E=REWRITEBASE:/]
# Remove index.php from URL
RewriteCond %{HTTP:X-Requested-With} !^XMLHttpRequest$
RewriteCond %{THE_REQUEST} ^[^/]*/index\.php [NC]
RewriteRule ^index\.php(.*)$ $1 [R=301,NS,L]
# Keep people out of codeigniter directory and Git/Mercurial data
RedirectMatch 403 ^/(system\/virtualpost\/cache|system\/codeigniter|\.git|\.hg).*$
# Send request via index.php (again, not if its a real file or folder)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
<IfModule mod_php5.c>
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>
<IfModule !mod_php5.c>
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
This is my /etc/apache2/sites-available/000-default.conf :
<VirtualHost *:80>
SetEnv MYSQL_DB_HOST localhost
SetEnv MYSQL_USER root
SetEnv MYSQL_PASSWORD spaces
SetEnv MYSQL_DB_NAME clevvermail
<Directory ...>
AllowOverride All
</Directory>
DocumentRoot /var/www
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
LoadModule rewrite_module modules/mod_rewrite.so
</VirtualHost>

Answer 1

I figured out that I had to config the apache2.conf file /etc/apache2/apache2.conf and change
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None <<-- Rewriting desactivated
Require all granted
</Directory>
to
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride All <<--Activate rewriting
Require all granted
</Directory>