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Sep 06, 2017 · The Ubuntu Install CDs contain software from the "Main" and "Restricted" repositories, so if you have no internet connection you can still install software from the CDs. If you have an internet connection you can install software from any Ubuntu repository. This page describes how to manage software repositories in Ubuntu.
Download the latest LTS version of Ubuntu, for desktop PCs and laptops. LTS stands for long-term support — which means five years, until April 2023, of free security and maintenance updates, guaranteed.