According to https://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_packages#Introduction Ubuntu 14.04 is no longer supported - but the information given on the page https://koha-community.org/download-koha/ still says that Koha is "Actively supported for packages: Debian 7 (Wheezy), Debian 8 (Jessie), Ubuntu 14.04 (Trusty Tahr)".

It would probably be a good idea to have correct and complete information about the system requirements of Koha at the very beginning of the manual for every Koha version as it is good practice for almost every other software.

* the manual of every Koha version
* the release notes of every Koha version (or a link to the respective manual)
* https://koha-community.org/download-koha/ (or a link to the respective manual)

The systems requirements can be changing with every new version, of course, thus it is not enough to say in the manual: "Full system recommendations can be found on the official Koha wiki along with the developer documentation: http://wiki.koha-community.org".

I suggest the manual of every Koha version should include a section with the exact requirements for the respective Koha version, e. g.

* supported Linux distributions
* supported version of Apache HTTP Server
* supported version of MySQL
* supported version of Perl

This would probably also be helpful for all the guys that are trying to install Koha on unsupported Linux distributions like CentOS, Redhat etc.