Copy and Paste the folowing lines to the terminal

sudo apt-get install php-pear

Then run:

sudo apt-get install imagemagick

Then run:
sudo apt-get install php5-dev

then:

sudo pecl install imagick

**if you get an error which looks like this:

configure: error: Cannot locate configuration program Wand-config 

or

 ERROR: /tmp/pear/temp/imagick/configure --with-imagick failed


then no problem, simply run the following command:

sudo apt-get install libmagickwand-dev libmagickcore-dev

Now re-run

sudo pecl install imagick

There would be something asking like "......[autodetect]" , just simply press enter once.

Configue in php.ini file by copy the code below to terminal

sudo gedit /etc/php5/apache2/php.ini

Add the following command to the php.ini 

extension=imagick.so