Problem enabling .htaccess

Question

I'm trying to enable .htaccess files on a Ubuntu server I set up. I changed the sites file from:

<VirtualHost *:80>
    ServerAdmin webmaster@localhost

    DocumentRoot /var/www
    <Directory />
     Options FollowSymLinks
     AllowOverride None
    </Directory>
    <Directory /var/www>
     Options Indexes FollowSymLinks MultiViews
     AllowOverride None
     Order allow,deny
     allow from all
    </Directory>

    [unnecessary config code omitted]

</VirtualHost>

to

<VirtualHost *:80>
    ServerAdmin webmaster@localhost

    DocumentRoot /var/www/document_root
    <Directory />
     Options FollowSymLinks
     AllowOverride None
    </Directory>
    <Directory /var/www/document_root>
     Options Indexes FollowSymLinks MultiViews
     AllowOverride All
     Order allow,deny
     allow from all
    </Directory>

    [unnecessary config code omitted]

</VirtualHost>

Now when I try to view a page in my browser I get a 500 Internal Server Error. Any ideas as to what my problem may be? Thanks for the help.

EDIT

Here is my .htaccess file:

RewriteEngine on
RewriteCond $1 !^(index\.php|images|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]

I checked the apache error logs as requested and it appears that the error being logged is:

[Fri Jul 10 19:39:12 2009] [alert] [client 192.168.1.1] /var/www/document_root/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

Answer 1

Bah... I didn't have mod_rewrite enabled. I feel stupid.