Install MongoDB on Ubuntu 12.04 LTS
How to Install MongoDB NoSQL Database Community Edition Release for Ubuntu 12.04 Precise Pangolin desktop.
Finally, the post’s Content is Expressly Reduced to Give Focus to the Essentials Instructions and Commands.

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Open Terminal Window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
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SetUp Apt Repo for Latest MongoDB Installation:
MongoDB Apt Repo Setup