Что я могу сделать?E: В репозитории «http://ppa.launchpad.net/gophers/archive/ubuntu focus Release» нет файла Release.

      Err:10 http://ppa.launchpad.net/gophers/archive/ubuntu focal Release
  404  Not Found 
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/gophers/archive/ubuntu focal 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.