/etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
allow-hotplug enp0s3
#iface enp0s3 inet dhcp
iface enp0s3 inet static
address 192.168.1.105
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 4.2.2.4 8.8.8.8
Restart Networking service to take effect.
$ sudo systemctl restart networking.service