I have exact the same problem. As soon as I confirm the default database name imscp the installation stops without any further message.
The problem is due to the size of the dialog. When a high resolution is too small, the program ends with a return code 255
As of August 14, 2016 issue urgent need to expand the setup screen in full screen 
He asks why the script to install the module?
I do not understand what he wrote?
why?
Site error: the file /var/www/virtual/site.com/hosting/htdocs/install/install.php requires the ionCube PHP Loader ioncube_loader_lin_5.5.so to be installed by the website operator. If you are the website operator please use the ionCube Loader Wizard to assist with installation. (19 hours ago).
Scripts Ioncube will work on my hosting or need to be activated in php.ini
how to activate ionCube?
Why do I get started ioncube24
I wanted to run ioncube
php -v
PHP 5.5.9-1ubuntu4.9 (cli) (built: Apr 17 2015 11:45:45)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
with the ionCube PHP Loader + Intrusion Protection from ioncube24.com (disabled) v5.0.7, Copyright (c) 2002-2015, by ionCube Ltd.
with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
How to connect to the hosting ioncube panel?
I have not solved the problem, and continued it in the forum thread for all to see,
I understand is ioncube (disabled) by default and must be easy to include in php.ini
php -v
PHP 5.5.9-1ubuntu4.9 (cli) (built: Apr 17 2015 11:45:45)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
with the ionCube PHP Loader + Intrusion Protection from ioncube24.com (disabled) v5.0.7, Copyright (c) 2002-2015, by ionCube Ltd.
with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
(disabled)?????
