What Installing Linux Means and Why You Might Do It

Installing Linux means replacing your current operating system — Windows or macOS — with Linux, or setting up Linux alongside your existing system on the same computer. Linux is a free operating system that works differently from what you may be used to, but it runs on nearly any hardware and gives you more control over how your machine works.

Most people install Linux because they want a system that runs faster on older hardware, costs nothing, or lets them see and change how the software actually works. Some install it because their work requires it. Others do it to learn how operating systems function. You do not need to be a programmer — the most popular versions of Linux are designed for everyday users.

Before you start, understand that this process will erase everything on your computer or the drive you choose. Back up any files you want to keep to an external drive or cloud storage first. If you are installing Linux alongside Windows or macOS, the process is more complex and requires careful disk partitioning — that is a separate task covered later in this guide.

Key Takeaways

  • You need a USB drive with at least 4 GB of space, a computer you are willing to erase, and about 30 minutes to an hour for the full process.
  • Download a Linux distribution like Ubuntu, Fedora, or Linux Mint from the official website, then write it to your USB drive using free software like Balena Etcher or Rufus.
  • Boot your computer from the USB drive by restarting and pressing a key like F12, Esc, or Del during startup, then select the USB drive from the menu.
  • Follow the installer's prompts to choose your language, timezone, disk, and create a user account — the installer walks you through each step.
  • After installation finishes and you restart, your computer will run Linux instead of its previous operating system.

Choosing a Linux Distribution and Getting the Installation File

A Linux distribution is a packaged version of Linux with its own installer, software store, and look. Ubuntu, Fedora, Linux Mint, and Debian are the most common for new users. Ubuntu is the easiest starting point — it has the most online guides and the largest community answering questions. Linux Mint is simpler if you are coming from Windows. Fedora is good if you want newer software but do not mind more frequent updates.

Go to the official website for the distribution you choose. For Ubuntu, that is ubuntu.com. For Linux Mint, it is linuxmint.com. For Fedora, it is fedoraproject.org. On the homepage, look for a button that says "Download" or "Get Ubuntu" — click it. You will see options for different versions. Choose the "LTS" (Long Term Support) version if one is listed — it receives updates for five years instead of nine months. Download the file to your computer. It will be named something like ubuntu-22.04-desktop-amd64.iso and will be between 2 and 4 gigabytes in size.

This file is called an ISO image. It is a complete copy of the Linux system, compressed into one file. You cannot run it directly — you have to write it to a USB drive first.

Creating a Bootable USB Drive

You need a USB drive with at least 4 GB of free space. Any USB drive will work — you do not need anything expensive. Plug it into your computer. Everything on this drive will be erased, so move any files off it first if it contains anything you want to keep.

Download free software that writes the ISO file to the USB drive. Balena Etcher works on Windows, macOS, and Linux and is the simplest option. Go to balena.io/etcher, download the version for your current operating system, and install it. Alternatively, on Windows you can use Rufus (rufus.ie), and on macOS you can use Disk Utility, which is built in.

Open Balena Etcher. Click "Select image" and choose the ISO file you downloaded. Click "Select target" and choose your USB drive from the list — be careful to pick the right one, because this will erase it. Click "Flash" and wait. The process takes 5 to 15 minutes depending on your USB drive speed. When it finishes, you can close Etcher and unplug the USB drive.

Restarting Your Computer and Booting from the USB Drive

Plug the USB drive into the computer where you want to install Linux. Restart the computer completely. As soon as it starts back up, before the operating system loads, press a key to enter the boot menu. The key varies by manufacturer — common ones are F12, F2, Esc, or Del. You may see a message on the screen saying "Press F12 to enter boot menu" or similar. If you miss it, restart and try again.

A menu will appear showing devices your computer can start from — usually your hard drive, your USB drive, and possibly a CD drive. Select your USB drive. The name will usually include "USB" or the brand of your drive. Press Enter. The computer will load Linux from the USB drive. This takes a minute or two.

You will see a screen with options. One will say something like "Try Ubuntu" or "Install Linux Mint". Do not click "Try" — that runs Linux from the USB without installing it. Click the option that says "Install" to begin the installation process.

Walking Through the Installation Steps

The installer will ask you a series of questions. First is language — choose the language you want Linux to use. Next is keyboard layout — select the layout that matches your keyboard. Then timezone — click your location on the map or type your city name.

The installer will then ask about disk partitioning. If you are erasing the entire computer and installing Linux as the only operating system, choose "Erase disk and install Linux" or similar. If you want to keep Windows or macOS and install Linux alongside it, choose "Something else" or "Custom" — this requires you to manually create a partition, which is more involved and is covered in the next section.

After you choose your disk, the installer will ask you to create a user account. Enter a name for your account, a username (usually lowercase, no spaces), and a password. Write down your password somewhere safe — you will need it to install software and make system changes later. Some installers will ask whether you want automatic login or to enter your password each time you start — either is fine for a home computer.

Review the summary screen. It will show the disk you selected, your timezone, and your username. If everything looks correct, click "Install" or "Confirm". The installer will now write Linux to your hard drive. This takes 10 to 20 minutes depending on your computer speed. Do not turn off the computer during this time.

Finishing Installation and First Startup

When the installer finishes, it will ask you to restart your computer. Click "Restart now". The computer will shut down. Remove the USB drive when prompted, or remove it as soon as the screen goes black. The computer will restart and boot into Linux for the first time.

You will see a login screen. Enter the username and password you created during installation. Click "Sign In" or press Enter. Linux will load your desktop. This first startup takes longer than usual — it may take a few minutes. Be patient and do not turn off the computer.

Once you are on the desktop, you have successfully installed Linux. Your computer is now running a completely new operating system. Take a moment to look around. You will see a taskbar or dock, a file manager, and a menu to open applications. The layout varies depending on which distribution you installed, but the basic idea is the same as Windows or macOS.

Installing Linux Alongside Windows or macOS

If you want to keep your current operating system and add Linux to the same computer, you need to create separate partitions on your hard drive — one for each system. This is more complex than erasing the entire disk, and mistakes can result in losing data.

Before you start, back up everything on your computer to an external drive. Then, on your current operating system, use the disk management tool to shrink your main partition. On Windows, right-click "This PC" or "My Computer", choose "Manage", then "Disk Management". Right-click your main drive (usually C:), choose "Shrink Volume", and reduce it by at least 50 GB. On macOS, open Disk Utility, select your drive, and click "Partition". Add a new partition and leave it blank.

Follow the steps above to create a bootable USB drive and boot from it. When you reach the disk partitioning step in the installer, choose "Something else" or "Custom partitioning". You will see your existing partition and the empty space you created. Create a new partition in the empty space for Linux. The installer will guide you through selecting the size and format. After installation, restart your computer. You will see a boot menu letting you choose between your original operating system and Linux each time you start up.

Frequently Asked Questions

What if my computer will not boot from the USB drive?

Restart the computer and try a different key to enter the boot menu — F2, Esc, and Del are common alternatives. If you still do not see a boot menu, your computer may have Secure Boot enabled. Restart, enter the BIOS or UEFI settings (usually by pressing F2 or Del during startup), find the Secure Boot option, and disable it. Then try booting from the USB drive again.

Can I undo the installation and go back to Windows or macOS?

If you erased the entire disk, you cannot undo it without a backup. If you kept your original operating system and installed Linux alongside it, you can delete the Linux partition using disk management tools and reclaim that space. If you want to return to your original system completely, you would need to reinstall it from installation media.

What do I do after Linux is installed?

Open the software store or package manager — it is usually in your applications menu — and search for programs you need. Most common software like Firefox, GIMP, LibreOffice, and media players are free and available through the store. You can also open a terminal and use command-line tools if you want to learn more advanced Linux skills.

Is it safe to install Linux on my main computer?

Yes, as long as you back up your files first. Linux is stable and widely used. The main risk is user error during installation — erasing the wrong disk or making a mistake during partitioning. Take your time, read each screen carefully, and double-check which disk you are installing to before confirming.

Do I need internet during installation?

No, the installer does not require internet. However, after installation finishes, connecting to the internet lets you download updates and additional software. Most installers will ask if you want to download updates during setup — you can skip this and do it later.