Clean URL setting for Ubuntu server

Install mod rewrite in Ubuntu server for Drupal

Run this command

#sudo a2enmod rewrite

Then restart apache2

#/etc/init.d/apache2 restart

FreeBSD 8.2 Apache22 Clean URL

Edit apache2 config file

# ee /usr/local/etc/apache22/httpd.conf

Change this line from

AllowOverride None
to 
AllowOveride All

Restart Apache2

# /usr/local/etc/rc.d/apache22 restart