How to Install Linux: A Safe, Step-by-Step Walkthrough

Before you touch anything, copy your important files to somewhere completely separate from the computer you are installing on. That means an external hard drive, a USB stick, or a cloud service. Focus on the things you cannot recreate: documents, photos, videos, project files, password databases, and anything in folders like Documents, Desktop, Pictures, and Downloads. If you use email or browser bookmarks that are not synced to an account, export those too.

This step matters because installing an operating system involves writing to your disk, and any mistake in partitioning can erase data permanently. A backup turns a worst-case scenario into a minor inconvenience instead of a disaster. Once your files are copied, open the backup and confirm you can actually see and open them. A backup you have not verified is only a hope, not a safety net.

⚠️ If you only have one copy of a file and it lives on the drive you are about to modify, treat it as already at risk until it is backed up and verified.

A Linux distribution, or distro, is a complete ready-to-use version of Linux. For a first install, choose something beginner-friendly and widely supported, such as Linux Mint, Ubuntu, or Fedora. These have large communities, so when you search for help you will find clear answers. Pick one and resist the urge to compare twenty options for hours; you can always try another later.

Go to the official website for your chosen distro and download the ISO file. An ISO is a single large file, usually a few gigabytes, that contains the entire system. Always download from the official site rather than a random mirror or download portal, and make sure the address starts with https. Note the version you are downloading and where it saved, because you will need both in the next steps.

A checksum is a long string of characters that acts like a fingerprint for the ISO file. The download page will list the official checksum, often labelled SHA256. By calculating the checksum of your downloaded file and comparing it to the official one, you confirm the file arrived complete and was not tampered with or corrupted during the download.

On Windows, open PowerShell and run Get-FileHash followed by the path to your ISO. On Linux or macOS, use sha256sum or shasum -a 256 with the filename. Compare the result to the official value character by character, or paste both into a text editor and check they match. If they do not match, delete the file and download it again rather than risking an install from a broken image.

⚠️ Installing from a corrupted ISO can cause confusing failures later, so do not skip this check even though it feels optional.

You need a USB stick of at least 8GB that you are willing to erase completely. The simplest tool for beginners is balenaEtcher, which works the same way on Windows, macOS, and Linux. Open Etcher, select your ISO, select your USB stick, and click Flash. On Windows, Rufus is another solid choice. Advanced Linux users can use the dd command, but Etcher is safer because it shows you exactly which drive it will write to.

Whatever tool you use, double-check that you have selected the USB stick and not your internal hard drive or your backup drive. The writing process erases the entire target device. When it finishes, the tool may warn you that the USB is unreadable in your file manager; that is normal and you can safely eject it.

⚠️ Selecting the wrong drive here will erase it instantly and without warning, so confirm the device name and size before you start.

You have two main paths. A full install wipes the entire disk and makes Linux the only operating system, which is the cleanest option and gives you all your space. A dual-boot install keeps Windows and adds Linux beside it, letting you choose which one to start each time you turn on the computer. Dual-boot is more complex but lets you keep one foot in familiar territory.

If you want to keep Windows, the safest preparation is to shrink your Windows partition from inside Windows first, using the built-in Disk Management tool, before you ever boot the installer. This leaves a block of unallocated space that the Linux installer can use without touching your Windows files. If you are giving the whole machine to Linux and your backup is solid, a full install is simpler and avoids dual-boot quirks.

⚠️ Resizing partitions always carries some risk, so confirm your backup is complete and verified before changing any partition sizes.

With the USB inserted, restart the computer and tell it to start from the USB instead of the internal drive. Most computers have a one-time boot menu you reach by tapping a key right as the machine powers on, commonly F12, F10, Esc, or F9. The correct key is often shown briefly on the startup screen, and your laptop maker publishes it online if you are unsure.

If the boot menu does not appear or the USB is not listed, you may need to enter the BIOS or UEFI settings and disable Fast Boot, or in some cases turn off Secure Boot, though many modern distros work with Secure Boot enabled. Once you select the USB, you should see the Linux startup screen. Pick the option to start or try the system, not the install option yet.

Most beginner distros boot into a live session, a fully working desktop running entirely from the USB without changing your hard drive. Use this time to test the basics: connect to wifi, open the browser, check that sound works and that the screen looks right. Nothing you do here is permanent, so explore freely. If something major does not work, you can stop now and try a different distro before committing.

When you are ready, double-click the Install icon on the desktop. The installer will ask for your language, keyboard, timezone, and a username and password. The important screen is the one about disk setup. Choose Install alongside Windows for dual-boot, or Erase disk for a full install, and read it carefully. Take your time on this screen, because this is where the actual changes to your disk begin.

⚠️ The Erase disk option deletes everything on the selected drive, so only choose it when you are certain and your backup is verified.

When the installer finishes it will ask you to restart and remove the USB stick. On the first boot you will land on your new Linux desktop or, in a dual-boot setup, a menu that lets you choose between Linux and Windows. Log in with the username and password you created. Congratulations, you are running Linux.

Now bring the system up to date. Open the software updater or run the update command for your distro, such as sudo apt update and sudo apt upgrade on Mint and Ubuntu. This pulls in the latest security fixes. Many distros also have a Driver Manager or Additional Drivers tool that can install proprietary graphics or wifi drivers with a click. Run the updates, install any recommended drivers, and reboot once more to finish.