Apologies for not replying back to this thread. I was able to resolve the issue by reverting back to a fresh install of 18.04 LTS.
It appears that ver 7.4 of PHP is the default with 20.04 and pnp4nagios (graphs) in Check_MK has issues with 7.4. Ubuntu 18.04 defaults to PHP 7.2 which pnp4nagios is happy with. I wasn’t up for back-reving PHP on 20.04.
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