Sometimes you may require to add the IP Address manually in ubuntu network Interface. Following are the steps to perform in order to add the IP Address manually in Ubuntu.

1. Login to Ubuntu server via ssh.
   
   
2. Hit the Following Command.
   
   

   # nano /etc/network/interfaces

3. Enter the interface alias eth0:0 as mentioned in below screen-shot. (Note: If you already have interface alias eth0:0, you can add eth0:1 or eth0:2 for additional IP Address)
   
   

   #secondary ip address
   
   auto eth0:0
   
   iface eth0:0 inet static
   
   address 1*3.2*8.149.***
   
   netmask 255.255.255.***
   
   

4. Below Command will up the added interface alias within the network.
   
   

   # ifconfig eth0:0 1*3.2*8.149.*** up

5. Restart the network service.
   
   

   # /etc/init.d/networking restart

6. check the newly added IP Address with the below command.
   
   

   # ifconfig

That's it. You are done with adding IP Address on Ubuntu server.