The old way of configuring Debian-based network interfaces was based on the ifupdown package. The new default is called Netplan, and although it's not terribly difficult to use, it's drastically ...
I changed the fixed ip address in network/interfaces on server XYZ, and "ip addr" reflects the change. I rebooted XYZ. I am able to ssh to the system using the new IP addr (192.168.1.1) . However ...