These steps closely follow How To Install Cassandra and Run a Single-Node Cluster on Ubuntu 14.04
As of now, Jun 5 2016, there are issues using Ubuntu 16 and Cassandra. Specifically, Ubuntu 16 comes with Python 3, and in order to run cqlsh Python 2 is required. It is recommended that Ubuntu 14 is used instead.
In order to install Cassandra, first install Java:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-set-default
To verify that the installation is successful, check the version:
java -version
The output will be something like:
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
Add the Cassandra repository
echo "deb http://www.apache.org/dist/cassandra/debian 35x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
echo "deb-src http://www.apache.org/dist/cassandra/debian 35x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
Add three public keys from the Apache Software Foundation associated with the package repositories:
gpg --keyserver pgp.mit.edu --recv-keys F758CE318D77295D
gpg --export --armor F758CE318D77295D | sudo apt-key add -
gpg --keyserver pgp.mit.edu --recv-keys 2B5C1B00
gpg --export --armor 2B5C1B00 | sudo apt-key add -
gpg --keyserver pgp.mit.edu --recv-keys 0353B12C
gpg --export --armor 0353B12C | sudo apt-key add -
Update the package database once again:
sudo apt-get update
Then install Cassandra:
sudo apt-get install cassandra
In order to troubleshoot Cassandra issues check Troubleshooting Cassandra.