Install Latest version of MongoDB in ubuntu.

mongo_install.bash

# Copy the following into a new file named `mongo_install.bash` in your home directory: 

apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | tee -a /etc/apt/sources.list.d/10gen.list
apt-get -y update
apt-get -y install mongodb-10gen

# Execute the following from your home directory: 

$ sudo bash ./mongo_install.bash

# If everything is successful, you should see the output contain a PID of the newly started MongoDB process: 
mongodb start/running, process 2368