Error Upgrading Zabbix

[abel5405]

Greetings,
I hope this is not a repeat question but I was trying to upgrade Zabbix from version 4 to version 5 and I am getting the following error:

The frontend does not match Zabbix database. Current database version (mandatory/optional): 4020000/4020001. Required mandatory version: 5000000. Contact your system administrator.

I am running Zabbix on Ubuntu 18.04 with PostgreSQL 10. is there a way I can fix this? Many thanks in advance for your help.

v/r
Chris

[Atsushi]

The database will be upgraded automatically when the Zabbix server is started. The database cannot be accessed from the web front end until the database upgrade process is complete.
Did the zabbix_server process start? Check the log as the progress of the upgrade is output to the Zabbix server log.

[abel5405]

The Zabbix server started ok and I did not see any errors in the logs. For a postgres back end, is there a special command for updating it? I think in the documentation it lists MySQL and not PGSQL.

[Atsushi]

No special command execution is required if Zabbix version is upgraded from 4.x to 5.0.
If Zabbix server is running and the database version is still for 4.x, it is possible that Zabbix server version is still old. Check the package version of Zabbix server installed.