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The easiest method is to download a Linux ISO from the distribution’s official site, write it to a USB with an image-writing tool, then boot the target computer from that USB. Do not drag the ISO onto a normally formatted drive: that usually stores a file but does not create the boot structures the computer needs.
Flashing normally erases the selected USB. Check the drive name and capacity before confirming, and copy off anything you need to keep.
What a bootable Linux USB actually is
An ISO is a complete disc image. A bootable USB is made when software writes that image—including its partition and boot data—to the drive.
- ISO copied as a file: ordinary storage; usually not bootable.
- Installation media: starts a Linux installer, often with a temporary live desktop.
- Live USB: runs Linux temporarily so you can test hardware, recover files, or troubleshoot without installing to the internal disk.
- Persistent live USB: stores selected settings and files between boots. Persistence is optional, distribution-dependent, and not the same as a full installation.
Before you begin
Gather the essentials
- The ISO from the Linux distribution’s official download page or an official mirror.
- A working Windows, macOS, or Linux computer.
- A USB flash drive with enough space. An 8 GB or larger drive is a practical choice for most current desktop images, but check the distribution’s requirement. Fedora’s referenced workflow specifies 4 GB, while an older Ubuntu tutorial specified 6 GB (Fedora; Ubuntu).
- Internet access if you still need to download the ISO or writing tool.
- A backup of the USB’s contents. Writing the image destroys its existing data.
A larger-capacity drive does not automatically make Linux faster. The drive’s quality, USB generation, and the target computer’s port matter more.
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Verify the ISO
Verification is worthwhile before installing an operating system or using the media for recovery. Compare a SHA-256 result with the value published by the distribution. A matching hash checks integrity against that reference; obtain the reference or signature from a trusted official source. Fedora also documents validating its OpenPGP signature (Fedora verification guidance).
- Linux:
sha256sum linux-distribution.iso - macOS:
shasum -a 256 linux-distribution.iso - Windows PowerShell:
Get-FileHash .linux-distribution.iso -Algorithm SHA256
Choose a writing tool
| Situation | Good first choice | Why | Trade-off |
|---|---|---|---|
| Windows, one ISO | Rufus or Etcher | Graphical workflow; Rufus exposes firmware and image-mode choices | Rufus is Windows-only; Etcher has fewer advanced controls |
| macOS | balenaEtcher | Three-step graphical process | A standard PC ISO is not automatically a native solution for Apple Silicon Macs |
| Ubuntu Desktop | Startup Disk Creator | Distribution-aligned and included or installable | Less general-purpose |
| Fedora | Fedora Media Writer | First-party workflow with image verification support | Specialized for Fedora media |
| Several ISOs on one drive | Ventoy | Install once, then copy ISO files and choose one at boot | Compatibility, Secure Boot, and persistence can require extra work |
Windows: create the USB with Rufus
Rufus supports Windows 8 and later and offers standard and portable builds. Use its current download page rather than relying on an old version number: rufus.ie.
- Download the Linux ISO from its official website.
- Download and open Rufus.
- Insert the USB and select the intended drive in Device. Confirm its model and size.
- Under Boot selection, choose Disk or ISO image if needed, click SELECT, and open the ISO.
- Leave most settings at their defaults unless the distribution or target computer says otherwise.
- Choose the partition scheme for the target computer: modern UEFI systems generally use GPT; older legacy-BIOS systems may need MBR.
- Click START. Approve any image-mode or download prompt Rufus displays.
- Read the warning and confirm that the selected USB may be erased.
- Wait for the completion status, then safely eject the drive.
Ubuntu notes that most Rufus options can remain at their defaults. If a modern UEFI computer will not boot the result, Ubuntu specifically suggests trying GPT with UEFI (non-CSM) (Ubuntu USB guidance; Ubuntu installation guidance).
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macOS: create the USB with balenaEtcher
Etcher’s workflow is Flash from file, Select target, and Flash! Download the build matching an Intel Mac or Apple Silicon Mac from etcher.balena.io, then:
- Download and verify the Linux ISO.
- Insert the USB and open Etcher.
- Choose Flash from file and select the ISO.
- Choose Select target, select the USB carefully, and confirm.
- Click Flash! and authenticate if macOS asks.
- Wait for writing and validation to finish, then eject the USB.
Creating media on a Mac is separate from booting Linux on that Mac. Ubuntu documents ordinary PC and older Intel-Mac use, but Apple Silicon systems such as M1 and later require hardware-specific support, including the community Ubuntu Asahi project; do not assume a standard PC-oriented USB will boot an M-series Mac (Ubuntu’s macOS guidance).
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Advanced macOS method: dd
A graphical writer is safer. Experienced users can write directly, but selecting the wrong disk can overwrite internal storage:
diskutil list
diskutil unmountDisk /dev/diskN
sudo dd if=~/Downloads/linux-distribution.iso of=/dev/rdiskN bs=4m status=progress
diskutil eject /dev/diskNReplace diskN only after identifying the USB with diskutil list; use the raw /dev/rdiskN target for the write.
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Ubuntu Startup Disk Creator
- Insert the USB and close applications using it.
- Open Startup Disk Creator; confirm the source ISO and target drive.
- Click Make Startup Disk and accept the erase warning.
- Wait for Installation Complete, then eject.
If it is not installed, Ubuntu provides the package command sudo apt install usb-creator-gtk (Ubuntu instructions).
GNOME Disks
- Open Disks and select the USB in the left sidebar.
- Open the drive menu and choose Restore Disk Image….
- Select the ISO, confirm the USB, and start the write.
- Eject when it finishes.
This route is documented in Ubuntu’s installation guide: documentation.ubuntu.com/desktop/en/26.04/tutorial/install-ubuntu-desktop/.
Etcher on Linux
Etcher also supports Linux. Package and installation routes are documented at etcher-docs.balena.io and its source is published at github.com/balena-io/etcher.
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Fedora Media Writer
- Install Fedora Media Writer from Fedora’s official page.
- Insert the USB, select a Fedora edition and target drive, and write the image.
- Confirm erasure, wait for completion, and reboot or eject.
Fedora’s page also explains checksum and OpenPGP-signature verification: fedoraproject.org/iot/download.
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- Install Ventoy to the USB once. This initial installation erases the drive.
- Afterward, copy one or more ISO files to the Ventoy partition using the normal file manager.
- Boot from the USB and select an ISO from Ventoy’s menu.
Ventoy is convenient for technicians and recovery collections because replacing an ISO usually means copying or deleting a file. It adds a bootloader layer, however; some images need compatibility modes, persistence requires separate configuration, and Secure Boot may present additional prompts. Ubuntu warned that Ventoy 1.1.11 had an issue preventing Ubuntu from installing correctly, so check the distribution’s current compatibility advice instead of assuming the newest release is always suitable (Ubuntu Ventoy guidance; Ventoy downloads). For a single ISO that will not boot, direct writing is the better troubleshooting baseline.
Boot the target computer from USB
- Leave the USB inserted and restart or power on the target computer.
- Immediately open the one-time boot menu. Common keys include
F12,F11,F9,Esc,F8, orDelete; the manufacturer determines the correct key. - Select the USB entry, often the one prefixed
UEFI:. - Choose the live session or installer shown by the Linux menu.
Ubuntu notes that F12 is common but not universal (Ubuntu boot-menu guidance).
If the USB is missing from the menu
- Reconnect it, try another port, and try a USB 2.0 port on older hardware.
- Disable Windows Fast Startup before firmware boot if applicable.
- Check whether firmware is in UEFI or legacy/CSM mode and recreate the drive with the matching GPT or MBR choice.
- Test with Secure Boot enabled first; try a distribution with signed support.
- Recreate the media with another writer or test another flash drive and computer.
Secure Boot and firmware compatibility
Secure Boot helps prevent unauthorized boot software from loading during startup (Microsoft explanation). Official Ubuntu media uses a signed shim bootloader trusted through the Secure Boot chain (Ubuntu Secure Boot documentation).
Keep Secure Boot enabled when the distribution supports it. Temporarily disabling it can diagnose a specific incompatibility, but it removes a platform security protection and firmware changes can affect an existing Windows installation. Behavior varies by distribution release, hardware, and bootloader.
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Persistence is optional
Ordinary live media normally resets documents, installed packages, and settings after reboot. Persistence stores selected changes on the USB for portable troubleshooting or a semi-portable workspace, but it can be slower and less durable than an SSD installation. Encryption, upgrades, and hardware support are also more complicated, and Ventoy persistence needs extra configuration.
Fix common failures
“I copied the ISO, but it will not boot”
Copying is not flashing. Recreate the drive with Rufus, Etcher, Startup Disk Creator, GNOME Disks, Fedora Media Writer, or Ventoy.
The writer does not show the USB
Reconnect it, try another port, close file-manager windows using it, and use the operating system’s Disk Management, Disk Utility, or Disks utility to remove damaged old partitions if necessary. A different flash drive may be the fastest test.
“No bootable device” appears
Re-download and verify the ISO, recreate the drive, check UEFI/legacy mode and the partition scheme, consider Secure Boot compatibility, and test another port or drive.
The wrong disk was selected
Stop immediately if you notice before writing. If it was already erased, stop using that disk and seek specialized recovery software; further writes reduce recovery chances.
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Writing reports success, but booting fails
A completed write does not prove firmware compatibility. Try another port or computer, another flash drive, a different writer, and the distribution’s official boot instructions.
Installation freezes or fails
Check ISO integrity, USB and memory health, the port, graphics or proprietary-driver issues, Secure Boot, distribution-specific installer bugs, and Ventoy compatibility. Use a direct writer instead of Ventoy while isolating a single-ISO problem.
The flashed USB has strange partitions
That can be normal. To reuse it as ordinary storage, erase its partition table and create a new partition with Disk Management, Disk Utility, or Disks. This also destroys any remaining boot media.
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dd writes an ISO directly to the whole device. It is scriptable but easy to misuse:
lsblk
sudo umount /dev/sdb1
sudo dd if=~/Downloads/linux-distribution.iso of=/dev/sdb bs=4M status=progress conv=fsync
syncReplace /dev/sdb with the actual USB device identified by lsblk. Use the whole device, not a partition such as /dev/sdb1, and verify the name again immediately before pressing Enter. A graphical writer is safer for beginners. Ubuntu discusses direct image writing at help.ubuntu.com/community/Installation/iso2usb.
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