UFW - Uncomplicated Firewall

Please note this tutorial is used in configuring the ufw for an ubuntu 18.04 server

1. Check whether ufw is installed or enabled by typing the following command : sudo ufw enable

2. If error still prevails install ufw by typing :
   sudo apt-get install ufw

3. Check status of ufw by typing : sudo ufw status

4.If status show inactive type : sudo ufw enable

NB - after activating ufw ensure that ssh is enable to allow you to access your server through ssh.