System Information

Linux kernel version

uname -r

Print hostname (a unique name that identifies a device connected to a computer network)

hostname

IP Addresses attached to the network interfaces

hostname -I

List network names

ls /sys/class/net

List all network interfaces and their ip addresses / mac addresses

ip addr show

Disable a specific network interface (for example: named: wlp2s0)

sudo ip link set wlp2s0 down
When we list the network interfaces, we will see "DOWN" next to the interface

Enable a specific network interface (for example: named: eno1)

sudo ip link set eno1 up
When we list the network interfaces, we will see "UP" next to the interface

In Ubuntu server console, to increase the font-size

Update/add /etc/default/console-setup file with the following:
FONTSIZE="16x32"
After update restart service - console-setup
sudo service console-setup restart

Set static ip address

Create /etc/netplan/00-installer-config.yaml
sudo touch /etc/netplan/00-installer-config.yaml
Set file permissions to 600
sudo chmod 600 /etc/netplan/00-installer-config.yaml
Example netplan config
network:

  version: 2

  ethernets:

    eno1:

      dhcp4: false

      addresses:

        - 192.168.86.50/24

      routes:

        - to: 0.0.0.0/0

          via: 192.168.86.1

      nameservers:

        addresses:

          - 8.8.8.8

          - 8.8.4.4

Apply netplan sudo netplan apply