I have a USB flash drive that has an iso file of Ubuntu 18.04 on it. To be honest, I don't really remember how I'd done that, might have been with Rufus on Windows, or with the Startup Disk Creator on Ubuntu.

Anyways, can I now simply overwrite the content of the flash drive (I want an iso file of a newer Ubuntu version)? If yes, do I follow the same steps as described here, or are there differences because there is already an iso file on my flash drive. I can currently boot from the flash drive.

1 Answer 1


Yes of course you can rewrite it with whatever you want. Flash drives are not one-time-use.

The tutorial you linked is the most authoritative/official source so that's a good guide to follow. There are also tutorials for doing the same on both Windows and Mac.

The tutorial to Install Ubuntu Desktop also includes instructions for creating the installation media using balenaEtcher which is a cross platform utility that works equally on all three operating systems.

  • Thanks. So do I understand it correctly that I simply erase the old files from the flash drive, or can I have two iso files on it (and in principle decide upon booting whether to install 18.04 or 20.04)?
    – Hermi
    Nov 10, 2022 at 9:46

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