I think I have solved the problem. I costed me hours...
I think it all had to do with updates, upgrades, versions etc.

This is the story :
I also had another problem with my raspian desktop environment, so I decided to solve that during waiting for an answer of this forum.
I could not open the tab ...

As a newbie, I do not understand the solutions in the links...
I have some information about my raspian :
pi@raspberrypi:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 10 (buster)
Release: 10
Codename: buster

I think this is OK.
But the ...

Try this command to start the installation with root privileges:

sudo curl -L install.domoticz.com | bash

Thanks but hat does'nt help...
I get exactly the same result.

Hello,
I am not able to install Domoticz on my RP3B.
I tried the easy way as mentioned on the website but the installation always stops at the same point.
It has to do with "Checking for libudev-dev." See:

pi@raspberrypi:~ $ curl -L install.domoticz.com | bash
% Total % Received % Xferd Average ...