Instruction to Set Static IP in Ubuntu in both Desktop and Server.

Setting-Static-IP-in -Ubuntu.txt

1. Information about current Networl.

$ ip a

or 

$ ipconfig -a

See the current adapter, eth0 for ethernet and wlan0 for wifi (probably).

Note, the Host IP, Subnet Netmask etc.

2.  Goto /etc/netplan directory

$ ls

to find "01-network-manager-all.yaml" or similar starting with 01- and end with .yaml, if not create this file.

Add the Lines, if setting for ethernet (eth0):

network:
 version: 2
 renderer: NetworkManager
 ethernets:
   eth0:
     dhcp4: no
     addresses: [172.23.207.254/20]
     gateway4: 192.168.1.1
     nameservers:
         addresses: [8.8.8.8,8.8.8.4]

Note:
addresses is ip you want to set, gateway4 is host ip.
you can define name server as you want, given is google's DNS nameserver.

3. Apply and test the changes

$ sudo netplan try