[ixpmanager] Upgrade from 4x to 6x

[Nick Hilliard]

billynkid--- via ixpmanager wrote on 15/04/2022 02:53:
> 500
> Server Error :: Call to undefined function IXP\Utils\Grapher\rrd_fetch()
> The rrd extension seems to be installed for PHP?

Can you check that the version of PHP is correct?  I.e. if you're 
running on php8.0, that you have the rrd extension installed for php 8.0 
and not, for example, php8.1 or 7.4.

# dpkg -l | grep php

Nick