How to resolve mcrypt extension missing error.

Error Message
"The mcrypt extension is missing. Please check your PHP configuration"

#apt-get install php5-mcrypt
#ln -s /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available    or    If this command not work fire below one for latest apache.
#ln -s /etc/php5/mods-available/mcrypt.ini /etc/php5/mods-available/
#php5enmod mcrypt
#service apache2 restart

Reload and check error message gone.