This is a very focused article on a similar issue which i encountered very recently. Problem: I recently installed Ubuntu Server 20.0 on a virtualBox. My intention was to use 2 network adapters as shown in the picture below. Host-Only Network NAT After setting up, I realised that i could not get IP address for the NAT adapter and it was always DOWN. Solution: Ubuntu20.0 comes with a different Newtork Configuration System compared to older ones like Ubuntu 14. The new Ubuntu uses netplan to handle network configurations. To solve this issue, you need to add specific information about every adapter into the netplan configuration file. The first adapter will always be configured by default. Follow through this article to learn how in 5 easy steps. 1. The picture below shows that my VM is already configured to use 2 network adapters. 2. Now i powered up the VM and check my network parameters. I powered the VM and ran the commands to check if my 2 network adapters we