Удачное обновление: в репозитории больше нет файла Release

У меня есть несколько установок Ubuntu Server 20.04, но только на одной из них происходит следующее:

sudo apt update
... password
Hit:1 http://repo.mysql.com/apt/ubuntu groovy InRelease
Ign:2 http://pe.archive.ubuntu.com/ubuntu groovy InRelease
Ign:3 http://pe.archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit:4 http://apt.postgresql.org/pub/repos/apt groovy-pgdg InRelease
Ign:5 http://pe.archive.ubuntu.com/ubuntu groovy-backports InRelease
Ign:6 http://pe.archive.ubuntu.com/ubuntu groovy-security InRelease
Err:7 http://pe.archive.ubuntu.com/ubuntu groovy Release
  404  Not Found [IP: 200.236.31.4 80]
Err:8 http://pe.archive.ubuntu.com/ubuntu groovy-updates Release
  404  Not Found [IP: 200.236.31.4 80]
Err:9 http://pe.archive.ubuntu.com/ubuntu groovy-backports Release
  404  Not Found [IP: 200.236.31.4 80]
Err:10 http://pe.archive.ubuntu.com/ubuntu groovy-security Release
  404  Not Found [IP: 200.236.31.4 80]
Reading package lists... Done
E: The repository 'http://pe.archive.ubuntu.com/ubuntu groovy 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://pe.archive.ubuntu.com/ubuntu groovy-updates 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://pe.archive.ubuntu.com/ubuntu groovy-backports 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://pe.archive.ubuntu.com/ubuntu groovy-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.

Что случилось? а как решить?