20.04 sudo apt update показывает ошибку: http://ddebs.ubuntu.com focal-security Release 404 Not Found

Я пробовал выполнить шаги по следующей ссылке:

https://wiki.ubuntu.com/Kernel/CrashdumpRecipe?action=show&redirect=KernelTeam%2FCrashdumpRecipe

К вашему сведению: команды, которые я использовал: sudo apt-get install linux-crashdump

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ECDCAD72428D7C01 sudo apt-get update Обновление Sudo apt показывает следующий результат:

Err:15 http://ddebs.ubuntu.com focal-security Release
  404  Not Found [IP: 185.125.188.12 80]

Reading package lists... Done
E: The repository 'http://ddebs.ubuntu.com focal-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.
W: GPG error: http://ddebs.ubuntu.com focal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C8CAB6595FDFF622
E: The repository 'http://ddebs.ubuntu.com focal Release' is not signed.
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.
W: GPG error: http://ddebs.ubuntu.com focal-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C8CAB6595FDFF622
E: The repository 'http://ddebs.ubuntu.com focal-updates Release' is not signed.
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.
W: GPG error: http://ddebs.ubuntu.com focal-proposed Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C8CAB6595FDFF622
E: The repository 'ddebs ubuntu com focal-proposed Release' is not signed.
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.
0
задан 21 October 2021 в 07:04

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