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Here is what it looks like:

sudo apt update                                  
Err:15 http://security.ubuntu.com/ubuntu impish-security Release                     
  404  Not Found [IP: 2620:2d:4000:1::19 80]
Reading package lists... Done                 
E: The repository 'http://security.ubuntu.com/ubuntu impish-security Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Pilot6
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Mohammad Faiz Ahanger
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    Are you actually running 22.04? because impish is ubuntu 21.10, which is now EOL (as of July 14) and therefore can't be updated – Esther Jul 26 '22 at 13:49
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    Following on from @Esther's comment, if you are actually running 22.04, your sources list is messed up. – Organic Marble Jul 26 '22 at 15:34
  • A gentle reminder: please remember to be nice to the New contributors: https://askubuntu.com/conduct – andrew.46 Jul 27 '22 at 02:43
  • I guess I may have added impish accidently while trying to install some 3rd party apps. Now, this is how I solved it: mkdir ~/.apt-backup mv /etc/apt/sources.list.d/impish-security.list* ~/.apt-backup Don't forget to add sudo. – Mohammad Faiz Ahanger Jul 29 '22 at 04:59

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