install mongoDB on Ubuntu

Steps

1) receive the key that 10gen has setup
   
   sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10

2) sudo vi /etc/apt/sources.list and add this line at the end
   
   deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

3) Update. This step is very important to load everything from sources.list from the previous step.

   sudo apt-get update

4) Install MongoDB.
   
   sudo apt-get install mongodb-10gen

5) Not done yet, create a dir as 
   
   sudo mkdir -p ~/data/db

6) Assign sudo persmissions

  sudo chown `id -u` /var/lib/mongodb

  sudo chown `id -u` /data/db

7) this step has not been tried and tested but i think this could be useful considering where the db is stored.

  mongod --dbpath=/home/user/mongodb or any other path you wish.