Power & Source of Big Ideas

I tried this once and failed, so I searched some more without any luck. Went back to ModMyPi. So I tried again by editing the dhcpcd.conf file, that did not exist in /etc sudo nano /etc/dhcpcd.conf And added: nohook lookup-hostname interface eth0 static ip_address=192.168.1.121/24 static routers=192...
Running a NEO2 with a NAS DOC on Ubuntu Xenial. I have tried several ways to configure Static IP address and it looses all connectivity to eth0 and need to enter system via the serial port. Is there a different approach to: sudo nano /etc/network/interfaces auto eth0 iface eth0 inet static address 1...