The installation documentation at https://docs.dhis2.org/2.30/en/implementer/html/dhis2_implementation_guide_full.html#installation for version 2.30 specifies the software requirements needed for the installation of dhis2. It does not however tell what specific version for each would be optimal for performance. What we have documented is for example ‘PostgreSQL database version 9.4 or later’. Our implementation started out with dhis2 2.26 (PostgresSQL 9.5, Java8, tomcat servlet container version 7). We have since moved to 2.30 over the last 2 years. We are wondering what would best suite this kind of implementation in terms of software requirements for best/optimal performance. For example might we need to upgrade PostgresSQL to 10?. Just to add to this, is there support for latest LTS version of Ubuntu(18.04)?