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I downloaded the latest ubuntu from the site and also the rufus. When I choose the iso file, rufus showed me truncated iso error. Plz help It told me to re download the file.

Haveed Hilal
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    Did you verify the ISO after download? (https://tutorials.ubuntu.com/tutorial/tutorial-how-to-verify-ubuntu#0) to ensure it was perfect before writing to installation media? Please also try and be precise with details.. as we can't know if you meant latest release, latest LTS (ie. 4 releases ago), or something different (latest daily - in which case which one?) nor architecture, nor product (Core? Server? Desktop?) you're asking about etc. – guiverc Jan 22 '22 at 09:51

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Plz help It told me to re download the file.

And that is exactly what you should do, because if Rufus tells you that the size of your ISO is smaller than the size it is declared to occupy, then your download IS corrupted and you need to download the ISO again.

You can also validate this by checking the SHA-256, which Rufus can do:

  1. Open your Ubuntu ISO in Rufus.
  2. Click the (✓) button next to the SELECT button.
  3. Visit https://releases.ubuntu.com/21.10/SHA256SUMS or https://releases.ubuntu.com/20.04.3/SHA256SUMS depending on whether you are using the latest Desktop or LTS.
  4. Check the SHA-256 field in Rufus. It should have the same value as the one you can find in the SHA256SUMS file from the web (for instance, if you downloaded ubuntu-21.10-desktop-amd64.iso it should be f8d3ab0faeaecb5d26628ae1aa21c9a13e0a242c381aa08157db8624d574b830).
  5. If the value you get from Rufus is not the same as the one from SHA256SUMS then your download IS corrupted and you will need to download the ISO again until the values match. There is NO other alternative but to download the ISO again (and possibly fix your network connection or a failing hard drive on your computer, if you consistently happen to download ISOs that are corrupted).
Akeo
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I solved the problem. Actually whenever I downloaded the iso and moved it into another place, its size would decrease. I instead copied the iso and found the iso perfect. I DISCOVERED THAT MOVING AN ISO IS NOT THE PROPER WAY.

Haveed Hilal
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    Moving a file should never change its physical size. If it does you have a problem. – David Jan 23 '22 at 15:47
  • Exactly ^^^ Do yourself a favor and DON'T make it worse by using obsolete and unsupported OSes - https://superuser.com/questions/1702775/windows-7-install-not-starting-hardware-or-software-change-could-be-cause - . You'll make yourself a perfect victim and for no good rational reason. – ChanganAuto Feb 02 '22 at 18:40