PHP Extension pcntl for 2.2.6

[aMiSTACX]

We have only seen this requirement on 2.2.6 and it's weird. 

Running 2.2.6 OSE

Ubuntu 18.04.1

NGINX 1.14.1

PHP 7.1.25

MySQL 5.7.23

This is not listed as a core php requirement. Stack is bleeding-edge up-to-date ;-) 

Ran composer update, and that did not fix requirement. 

* Updated 12/14/2018 - We will mark this as unresolved. We decided to proceed to 2.3.0. 

Screenprint: 

Thanks in advance!

A.I

[Kavitha Mano]

pcntl module was included when you installed php by package manager, try to sudo apt updatethen sudo apt-get upgrade, it may be helpful. You can also use this to confirm if you have or don't have it.

php -i | grep pcntl
//pcntl suppport=>enable

[dunagan5887]

I am also seeing pcntl included in PHP CLI, but not seeing it included for php-fpm by default. This is causing the setup process to fail in a browser window during initial setup. Does installing Magento 2.2.6 require a customized PHP compilation which explicitly includes the pcntl extension in order to get Magento working via php-fpm?