Now WebHTB Professional is much easier to install, more compatible with Linux's diversity !
Changes from previous version 1.1 :
"Apache" web server is no longer used because it can not be started as root, which necessarily requires a cumbersome installation of su_php module. Anyway on Ubuntu and CentOS this module was not working anyway.
Now use "Nanoweb", this being written in PHP makes it very easily extensible with custom modules, and secure because - running inside the Zend scripting engine - it's immune to a number of common security threats (format strings, buffer overflows, ...).