Install lighttpd:
sudo aptitude install lighttpd
Install PHP and ImageMagick:
sudo aptitude install php5-common php5-dev php5-mysql php5-sqlite php5-cgi php5-curl php5-gd php-pear libmagick9-dev
Install iMagick:
sudo pecl install imagick
Press enter on prompt.
Add the following to the bottom of /etc/php5/cgi/php.ini:
extension=imagick.so
Then:
sudo lighttpd-enable-mod fastcgi
sudo /etc/init.d/lighttpd reload