How to Make a Bootable Linux USB (3 Easy Ways)

A bootable Linux USB lets you try a full operating system, repair a broken PC, or install Linux permanently — all from a flash drive. Here are the three most reliable ways to make one, what can go wrong, and how to boot from it once it's ready.

What you need

Three things: a USB flash drive of 8 GB or more (everything on it will be erased), the ISO file of the Linux distribution you want, and a flashing tool. Download ISOs only from the official site — ubuntu.com, linuxmint.com, or kali.org — and, if the page lists a SHA256 checksum, verify your download against it before flashing. A corrupted ISO is the single most common cause of a USB that refuses to boot.

Method 1: balenaEtcher (easiest, works on Windows, macOS, and Linux)

balenaEtcher is the simplest option and is almost impossible to get wrong: it hides your system disks so you can't accidentally erase the wrong drive.

Download and open balenaEtcher (free, no install needed on Windows).
Click “Flash from file” and pick your ISO.
Click “Select target” and choose your USB drive.
Click “Flash!” and wait — Etcher writes the image and then verifies it.

Method 2: Rufus (Windows only, more options)

Rufus is faster than Etcher and exposes useful options. Pick your device, select the ISO, and for any modern PC leave the partition scheme on GPT with UEFI target. Rufus can also add a persistence partition to some distributions, which lets a live USB remember files and settings between reboots — something a plain flash can't do.

Method 3: dd (Linux and macOS terminal)

On a system that already has a terminal, `dd` needs no extra software: `sudo dd if=ubuntu-24.04.iso of=/dev/sdX bs=4M status=progress conv=fsync`. The catch: if you point `of=` at the wrong disk, dd will silently destroy it. Double-check the device name with `lsblk` (Linux) or `diskutil list` (macOS) before you press Enter. There is no undo.

Booting from the USB

Insert the drive, power on, and tap the boot-menu key during startup — usually F12, F11, Esc, or F9 depending on the maker (on a Mac with an Intel chip, hold Option/Alt). Pick the USB entry, choose “Try or Install” from the menu, and you're in a live session within a minute or two.

If the USB doesn't appear: re-flash with verification, try a different USB port (prefer USB-A 3.0 directly on the board, not a hub), and check whether Secure Boot is blocking it. Ubuntu and Linux Mint boot fine with Secure Boot enabled; Kali usually requires turning Secure Boot off in the firmware settings.

Skip all of this with a pre-made drive

If you'd rather not download a 5 GB ISO, find a spare drive, and troubleshoot flashing — that's exactly what our QuickSave drives are for. Each one is flashed from the official ISO, tested on real hardware before it ships, and arrives ready to boot Ubuntu, Mint, Kali, and more.

Frequently asked questions

Will making a bootable USB erase my files?

Yes — flashing overwrites the entire USB drive. Back up anything on it first. Your computer's own disk is untouched until you explicitly choose to install Linux on it.

Why won't my bootable USB show up in the boot menu?

The three usual causes: a corrupted flash (re-flash and verify), the firmware expecting UEFI while the USB was written for legacy BIOS (or vice versa — re-flash with GPT/UEFI in Rufus), or Secure Boot blocking an unsigned distribution like Kali.

Can I use the same USB on both an old BIOS PC and a new UEFI PC?

Often yes — most official Ubuntu, Mint, and Kali ISOs are hybrid images that boot in both modes. If one machine refuses, re-flash targeting that machine's mode specifically.