GUI fails to start after manual installation or upgrade on Ubuntu nodes

The IBM Storage Scale management GUI startup might fail after manual installation or upgrade on Ubuntu 18.04 nodes.

The following error message is displayed.

Job for gpfsgui.service failed because the control process exited with error code

When you upgrade from Ubuntu 16.x to Ubuntu 18.x, the PostgreSQL database server might be running with cluster versions (9.x and 10.x) with the default set to version 9.x. In this scenario, after manual installation or upgrade of the IBM Storage Scale management GUI, the GUI restarts once before it starts to run successfully. Systemd reports a startup error of the gpfsgui.service unit. The IBM Storage Scale GUI clears the database and creates it on the PostgreSQL 10.x instance. This error message can be ignored.