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In this article, I will show you how the sources.list file is used on Ubuntu.
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The APT package manager and all the graphical front ends (Ubuntu Software Center, Muon, aptitude etc) uses the sources.list file to learn about which package repository or repositories to use. Ubuntu uses the APT (Advanced Package Tool) package manager to manage packages. Ubuntu is based on Debian GNU/Linux distribution. So a package manager is included on your favorite Linux distribution. You also need a way to manage (install, remove, download) these packages from the package repository. These webservers or FTP servers are called package repository.
#LST SERVER EXAMPLE INSTALL#
Then the extra packages are hosted on a webserver or FTP server of the Linux distribution from where users can download and install it. It is easier develop, distribute, and download for users and a more modular approach. That way, they could include very common utilities and make the installation smaller. So the operating system needs a mechanism to install packages easily as needed. Including them all in a single operating system package would make the size of the operating system unnecessary large and harder to distribute. Now, there are so many softwares on Linux that you can’t even count. Ubuntu, Debian, CentOS, Fedora and others are Linux distributions or Linux based operating systems. This is called a Linux based operating system or a Linux distribution.
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So when you install it, you can start working with the program you need. So different companies and individuals packaged important tools (or softwares) on top of Linux kernel and packaged it for you. Again, installing programs on top of Linux kernel is not something ordinary people would love to do. Without useful programs, Linux kernel is of no help to ordinary users. You have to install it on top of the Linux kernel separately in order to use it. Let’s say, you want to edit a file with nano text editor. It’s a software that manages the hardware, allocates memory to programs, helps you run the program, and other basic very low level task for you. Well, Linux kernel itself can’t do very fancy things. Now you may ask, “What is a Linux distribution?” These are actually different Linux distributions.
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If anyone asks, “what operating system do you use?” Most of you might say, “I use Linux”. We use Ubuntu, Debian, CentOS and different operating systems.