Install mongodb on Ubuntu

1. import public key

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10

2. create /etc/apt/sources.list.d/10gen.list

deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

3.

sudo apt-get update

4.

sudo apt-get install mongodb-10gen

Reference: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-ubuntu-linux/