First, provide proper information if you want help:
Second, your system is severely screwn up when it doesn’t even know the systemctl command.
Third, your DHCP/DNS setup is probably bad which is why your box didn’t obtain a proper IP or cannot use your DNS resolver.
@bauerpower same for you, but don’t invade others’ thread please.
Read the debug guide for things to try.
Your best bet is to fix your router first and then to install again from scratch using the openHABian image. You seem to be using a RPi4/8GB (not a good choice as the docs tell you) which does not work with ZRAM but the install routine should recognize that and not install ZRAM in the first place.