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When you update Ubuntu using the apt update command, the apt package manager gets the information about the available packages (and their version info) from the repositories and stores them in local cache. In fact, you can go to the above server address and see how the repository is structured. Repository information is usually in the following format: deb bionic main The APT package manager gets the repository information from the /etc/apt/sources.list file and files listed in /etc/apt/ directory. This centralized way of providing software is one of the main strong points of using Linux. Ubuntu provides a set of repositories so that you won’t have to search on the internet for the installation file of various software of your need. A repository is nothing but a server that contains a set of software. Have you ever wondered where does the apt program install the programs from? How does it know which packages are available and which are not?Īpt basically works on the repository. So all the software (except Snap packages) that you see in the Software Center are basically from APT. This is the same APT package manager that Ubuntu Software Center utilizes underneath. Okay, so you already know that to install software in Ubuntu, you can use the apt command. I’ll explain all these questions in detail here. You installed the universe and multiverse repository but do you know what are these repositories? How do they play a role in installing packages? Why are there several repositories? You can enable universe and multiverse repositories in Ubuntu using the commands below: sudo add-apt-repository universe

You search on the internet and come across a solution that you have to enable universe or multiverse repository to install that package.

You are surprised because the package should be available.

So, you are trying to follow a tutorial from the web and installing a software using apt-get command and it throws you an error: E: Unable to locate package xyz This detailed article tells you about various repositories like universe, multiverse in Ubuntu and how to enable or disable them.