To upgrade mongodb follow steps bellow :

$[/home/witr] sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10

$[/home/witr] echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list

$[/home/witr] sudo apt-get update

$[/home/witr] sudo apt-get install mongodb-10gen

Note While upgrading you have dpkg-deb error processing at step 4 /var/cache/apt/archives/mongodb-10gen_2.4.11_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

You must remove mongodb-clients before apt-get install :

$[/home/witr] sudo apt-get remove mongodb-clients

$[/home/witr] sudo apt-get install mongodb-10gen