Set static IP Ubuntu

sudo nano /etc/network/interfaces

and paste this under # The primary network interface:

auto enp0s25
iface enp0s25 inet static
address 192.168.0.16
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 8.8.4.4 8.8.8.8

sudo ip addr flush enp0s25
sudo systemctl restart networking.service

Then verify it is correct:

ip add