WordPress doesn’t resize the uploaded images

I was trying to upload some images to a WordPress (LEMP: Linux Debian, nginx, MySQL, PHP 7.0).  The images were stored correctly, but it weren’t resized to the thumbnail, medium and large sizes.

The problem: the server hadn’t installed the GD extension.

The solution was to install the extension and restart the server:

# sudo apt-get install php7.0-gd

# sudo systemctl restart nginx.service

If you are using Apache

# sudo systemctl restart apache2.service

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