Install Oracle Java 1.8​:

• sudo apt-get update​
• sudo add-apt-repository ppa:webupd8team/java​
• sudo apt-get update​
• sudo apt-get -y install oracle-java8-installer​​

Install Cassandra​:

• echo "deb http://www.apache.org/dist/Cassandra/debian 310x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list​
• curl https://www.apache.org/dist/Cassandra/KEYS | sudo apt-key add -​
• sudo apt-get update​
• sudo apt-get install cassandra​
• sudo service cassandra status​
• sudo nodetool status​