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Ubuntu has simple firewall you can install. UFW (Uncomplicated Firewall) is a basic firewall that works very well and easy to configure with its Firewall configuration tool.

To install UFW and enable it, simply execute this command:

sudo apt-get install ufw

Allow SSH and Http services.

sudo ufw allow ssh
sudo ufw allow http
sudo ufw deny 23
sudo ufw default deny

Enable the firewall.

sudo ufw enable

Check the status of the firewall.

sudo ufw status verbose

You can see all the changes in the IPTables config:

sudo iptables -L