The server does not have ImageMagick or GD installed and/or enabled! Any of these libraries are required for WordPress to be able to resize images. Please contact your server administrator to enable this before continuing.

Jika wordpress muncul :
The server does not have ImageMagick or GD installed and/or enabled! Any of these libraries are required for WordPress to be able to resize images. Please contact your server administrator to enable this before continuing.

ubuntu
intall paket ini :

untuk php 5.6
sudo yum install rh-php56-php-gd
sudo service httpd restart

untuk php 5.5 :
sudo yum install php55-php-gd
sudo service httpd restart

Menginstall ke default /atau ini yang pernah dicoba 5.4
yum install php-gd
sudo service httpd restart

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php5-imagick