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I build custom ISO Ubuntu 20 according to this article. After the custom ISO is ready, I install the OS from it, and at first, the error appears: Check finished errors found in 1 files. Could you tell me how to find this error and fix it? I already checked md5sum, I read about it.

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  • You've tagged 20.04, but refer to Ubuntu 20 (which doesn't exist, but is closest to Ubuntu Core 20 which is a different product to 20.04). The wiki page refers to md5sums, which are deprecated & replaced by sha256sums. (you should have noticed that at the download page cdimage.ubuntu.com/ubuntu/releases/20.04/release) Note: this is opinion only, if I knew it was fact, I'd correct the wikipage which I believe to be outdated.
    – guiverc
    Dec 18 '20 at 11:46
  • If errors are reported and you need help solving the problem, it might be useful to include actionable error messages. There are a million reasons for why something might not be working as expected.
    – user1091774
    Dec 26 '20 at 4:40
  • I have been seeing the same error with the xubuntu-20.04.1-desktop-amd64.iso image. There is no actionable error message. This is a check done when you start the boot process - it reports the error exactly as described (Check finished errors found in 1 files! You might encounter errors.). Otherwise, everything still seems to work. To be clear: I checked the SHA256 checksum, reburned the image to my USB, burned it again with Startup Disk Creator, tried again with dd, tried a different USB, downloaded from a different mirror, downloaded a torrent, and then tried all those things again...
    – topsail
    Dec 27 '20 at 2:22
  • a related issue (and link to a bug report) is here: answers.launchpad.net/ubuntu/+question/691933
    – topsail
    Dec 28 '20 at 18:03
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Based on what I can discover from looking at this bug report and discussion (Check error with 20.04-desktop ISO) it appears this is just a built-in limitation of the file checking where the efi.img file is modified when it is loaded and that really means it can't be verified. I would advise go ahead and ignore this error! That is what I have done with my Xubuntu installation and I have had no problems at all (since then I have also noticed this error when installing Ubuntu Mate and I also ignored it in that case as well!)

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  1. Press ctrl + c to stop checking or skip this process.
  2. Use "Try Ubuntu".
  3. Then, Install Ubuntu 20.04 lts from inside "Try Ubuntu". Note: Don't remove your boot-able Pen-drive until it saying to remove it.

I faced same issue like yours and above was helpful.

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  • you could format your buttons better with <kbd> ... </kbd>. May 21 at 23:18

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