The RSK network is the Smart Contract platform of Bitcoin, it offers the same capabilities of Ethereum, but the gas is paid with Bitcoin.
When your application needs to interact with the network by publishing or calling a Smart Contract you need a node synchronized.
This video of the series explains how to install a node on Ubuntu using the PPA. The video is closed captioned, and bellow you will find the step by step easy to copy and paste.
Open a terminal and run the following commands to prepare your machine:
sudo add-apt-repository ppa:rsksmart/rskj sudo apt-get update
Install the RSK node by running the command:
sudo apt-get install rskj
Accept the Terms and Conditions, press ESC, then accept.
Select between Mainnet, Testnet or Regtest
Start the node by running the command:
sudo service rsk start