Ubuntu
You need to know the static IP, netmask and gateway IP. To test your network, set static IP temporarily:
# ip addr // get the interface name: eth0
# ifconfig eth0 10.32.22.10 netmask 255.255.255.0
# route add default gw 10.32.22.254 eth0
Then test network with "ping" command. If it's OK, set it permanently:
# cat /etc/network/interfaces // before modification: dhcp
auto eth0
iface eth0 inet dhcp
# cat /etc/network/interfaces // after modification: static IP
auto eth0
iface eth0 inet static
address 10.32.22.10
netmask 255.255.255.0
gateway 10.32.22.254
Now reboot the static IP will take effect.
Note that the value of "gateway" is determined by route -n,
the value in column "Gateway" after destination "0.0.0.0".
Arch Linux
# ip addr flush enp2s0
# ip addr add 10.32.22.10/24 dev enp2s0
# ip route add default via 10.32.22.254