How do I install latest version of mongodb-clients on Ubuntu using apt-get?
apt-get install mongodb-clients only installs version
Use official MongoDB Documents they already mentioned how to install a version of your choice. Steps for installation for Ubuntu 12.04 and 14.04
For Ubuntu 16.04 use this
NOTE:- Before that beware that you don't have any existing repository file for MongoDB. You can check using sudo apt-get update.While updating it will show if you have any. If you have then delete it using sudo rm /etc/apt/sources.list.d/mongodb*.list and then install MongoDB