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when I am running this ubuntu command below error is coming:

For installation I am using this link: https://jkjung-avt.github.io/opencv-on-nano/

Err:12 http://old-releases.ubuntu.com/ubuntu xenial-security Release                                                                                                                                       
  404  Not Found [IP: 91.189.88.248 80]
Reading package lists... Done                                                                                                                                                                              
E: The repository 'http://old-releases.ubuntu.com/ubuntu xenial-security Release' does not have a Release file.
AEM
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Pooja Kumari
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  • If you're on 18.04, why do your sources say 16.04? FYI: Xenial isn't found in old-releases because of ESM. – guiverc May 04 '21 at 07:47
  • [Ubuntu 16.04 LTS has reached the end of it's *standard* support life](https://fridge.ubuntu.com/2021/03/13/extended-security-maintenance-for-ubuntu-16-04-xenial-xerus-begins-april-30-2021/) thus is now off-topic here unless your question is specific to helping you move to a supported release of Ubuntu. Ubuntu 16.04 ESM support is available, but not on-topic here, see https://askubuntu.com/help/on-topic – guiverc May 04 '21 at 07:48
  • Can you please elaborate what i can do for ESM – Pooja Kumari May 04 '21 at 08:06
  • Ubuntu 16.04 has ended it's *standard* support yes, but it's repositories have not moved (*arm64* packages for grub+shim hadn't completed move to 'main' last I heard.. when the move has completed it'll trigger....) however 16.04 is now off-topic on this site and your paste shows *xenial* but you've tagged *bionic* so your question is unclear & currently makes no sense. – guiverc May 04 '21 at 08:09

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