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Thread: Confusion with iso verification

  1. #1
    Join Date
    Jul 2016

    Confusion with iso verification

    Hello. I hope everyone is well and healthy.

    Ubuntu 20.04 here and I need to rebuild machine.

    Downloaded ubuntu-20.04.3-desktop-amd64.iso
    Downloaded SHA256SUMS (current nautilus doens't acutally download the file so opened and pasted into text file, named SHA256SUMS)
    Downloaded SHA256SUMS.gpg

    run commands:
    gpg --keyid-format long --verify SHA256SUMS.gpg SHA256SUMS
    gpg: Signature made Thu 26 Aug 2021 05:52:49 AM EDT
    gpg: using RSA key 843938DF228D22F7B3742BC0D94AA3F0EFE21092
    gpg: Can't check signature: No public key

    The tutorial assumes there are two key ID's present in the faulty output - RSA and DSA. Yet when I run this there is only the above and this does not match anything in the tutorial.

    At this point I don't know what to do.

    Any help much apprciated.
    Last edited by bulgin; August 28th, 2021 at 11:39 PM.

  2. #2
    Join Date
    May 2008
    Ubuntu 20.04 Focal Fossa

    Re: Confusion with iso verification

    Open a terminal
    Navigate to the location of your ISO (probably Downloads)
    cd Downloads
    sha256sum ubuntu-20.04.3-desktop-amd64.iso
    Does the output match the published checksum:- 5fdebc435ded46ae99136ca875afc6f05bde217be7dd018e18 41924f71db46b5 *ubuntu-20.04.3-desktop-amd64.iso

  3. #3
    Join Date
    Jul 2016

    Re: Confusion with iso verification

    well duh, stupid me. Yes it does. So what's all the fuss with the other steps suggested by the tutorial?

    Thank you so much!
    Last edited by bulgin; August 29th, 2021 at 04:26 AM.

  4. #4
    Join Date
    Jul 2005
    I think I'm here! Maybe?
    Xubuntu 20.04 Focal Fossa

    Re: Confusion with iso verification

    It is always worth using a torrent system to download Ubuntu iso images as they automatically check each packet of the iso as it is downloading making a check after the event pointless.
    It does not matter which torrent client you use, it is built in to all of them.

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