[Koha] How to upgrade Koha from 17.05 to Latest stable release on Ubuntu 14.04

[Michael Kuhn]

Hi

 > Can i used the ubuntu 14.04 for latest koha release or have to also
 > upgrade the ubuntu.

You may use whatever you want - all at your own risk.

If you want to use Koha 19.05, only the following operating system 
distributions are supported:

* Debian 8 (Jessie)
* Debian 9 (Stretch)
* Ubuntu 16.04 (Xenial)
* Ubuntu 18.04 (Bionic)

See: https://koha-community.org/download-koha/

However, since Ubuntu 14.04 is no more supported itself since April 
2019, no one should use Ubuntu 14.04 anymore. Only do it if you enjoy 
security risks.

Best wishes: Michael
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