Update php 7.0 to newer version

[Mark_Mueller-Chytry]

They have the nearly the same error, but did not understood what is to do:

Upgrade php 7.0 to 7.3

yep, you surely hit a hint there. The strange REBOOT needed in some case when you have broken dependencies … Normaly, you never-ever reboot a server. Found out when playing with php/apache2 switch/upgrade, sometime a service restart or stop/start is not enought.