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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.
karel
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Erlangga
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    PPAs are 3rd party software repositories, with all security checks on you to perform. Did you perform any checks? That PPA was abandoned in 2019 thus expecting it to support a release from 2020 makes no sense. (ie. https://launchpad.net/~gophers/+archive/ubuntu/archive which was taken from your pasted details) – guiverc Jul 04 '23 at 10:01

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