Update Could not create directory?

You may not have the permissions correct for the root folder or one of the folders it’s trying to create. If you are using a default install of LAMP and have terminal access then all you need to do is issue this command as root. chown -R www-data:www-data /var/www/

This will change the owner of the web folder to www-data and allow the site permission to adjust any file within the default web directory.