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I downloaded ubuntu 21.10 a while back and made it my main OS but since have rarely used my PC I am a novice with Ubuntu and encountering difficulties when trying to update.

This error appears when I run sudo apt-get update

Error:9 http://ppa.launchpad.net/flatpak/stable/ubuntu impish Release        
  404  Not Found [IP: 185.125.190.52 80]
Ign:10 http://archive.ubuntu.com/ubuntu impish-backports InRelease
Err:11 http://archive.ubuntu.com/ubuntu impish Release
  404  Not Found [IP: 91.189.91.39 80]
Err:12 http://archive.ubuntu.com/ubuntu impish-security Release
  404  Not Found [IP: 91.189.91.39 80]
Err:13 http://archive.ubuntu.com/ubuntu impish-updates Release
  404  Not Found [IP: 91.189.91.39 80]
Err:14 http://archive.ubuntu.com/ubuntu impish-backports Release
  404  Not Found [IP: 91.189.91.39 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.
E: The repository 'http://ppa.launchpad.net/flatpak/stable/ubuntu impish Release' does not have 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.
E: The repository 'http://archive.ubuntu.com/ubuntu impish Release' does not have 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.
E: The repository 'http://archive.ubuntu.com/ubuntu impish-security Release' does not have 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.
E: The repository 'http://archive.ubuntu.com/ubuntu impish-updates Release' does not have 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.
E: The repository 'http://archive.ubuntu.com/ubuntu impish-backports Release' does not have 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.
Rishon_JR
  • 1,013
Mikey Clark
  • 1
  • sudo apt-get update doesn't fully upgrade the Latest O.S. Maybe try do-release-upgrade – Rishon_JR Sep 01 '22 at 15:12
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    Does this answer your question? How to install software or upgrade from an old unsupported release? 21.10 is now EOL – graham Sep 01 '22 at 15:15
  • The warning about 21.10 being EOL (six weeks before) and again at EOL (https://fridge.ubuntu.com/2022/07/19/ubuntu-21-10-impish-indri-end-of-life-reached-on-july-14-2022/) include the upgrade instructions. You're now beyond that date, thus have an extra step covered in https://help.ubuntu.com/community/EOLUpgrades as your archives are gone (due to EOL) and need to be *manually* corrected to allow for this (a step that isn't required whilst release is supported, or briefly after EOL) – guiverc Sep 01 '22 at 19:20
  • PPAs however being 3rd party sources, are free to drop support for any EOL release (the official ones tend to do that, as updated builds are no longer possible) which may thus require manual intervention. You should release-upgrade whilst release is supported, as the drop or move is only listed as occurring after the EOL, so it maybe the next day, or many weeks after the EOL. – guiverc Sep 01 '22 at 19:21

0 Answers0