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that is the error wich appear when i try to update

E: The repository 'http://ppa.launchpad.net/fingerprint/fprint/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.

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This error message tells you, that the given repository does not support the Focal Fossa release.

The fprint library is included in the official repository as libfprint. I would recommend removing the launchpad repo by going into the "Software & Updates" and unticking it under "Other software". The error should go away and you may install the library from the official repo (it may already by installed).

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