Unable use of .htaccess in apache2 Ubuntu 12.04

To use .htaccess file in  Ubuntu 12.04 you have to modified /etc/apache2/sites-available/default file

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

change to 

DocumentRoot /var/www/abc.biz
<Directory />
    Options FollowSymLinks
    AllowOverride All
</Directory>
<Directory /var/www/abc.biz/>
    Options Indexes FollowSymLinks MultiViews
    AllowOverride All
    Order allow,deny
    allow from all
</Directory>