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Hi!
the error:

Fatal error: Call to undefined function curl_init() in /var/www/html/wp-content/plugins/gravityforms-hubsapot/library/hubspot/class.baseclient.php on line 223

Vers?o do PHP 5.6.11-1ubuntu3.1
Vers?o do MySQL 5.6.28
Vers?o do WordPress. 4.4.2
Vers?o do Gravity Forms. 1.9.18