У вашего броузера проблема в совместимости с HTML5
Video covers how you can Install Cassandra on a single node environment (on Ubuntu)
Step 1: Install Java
Step 2: Download and extract Cassandra
Step 3: Update .bashrc
export CASSANDRA_HOME = folder here
export PATH = $PATH:$CASSANDRA_HOME/bin
Step 4: run cassandra -f
run: cqlsh
run some examples