thank you for the chance to post my problem. I am trying to update and receive the following

E: The repository 'http://ppa.launchpad.net/bumblebee/stable/ubuntu bionic 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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There is no bionic (elementary os hera is based on it) version on this repository - http://ppa.launchpad.net/bumblebee/stable/ubuntu/dists/ . You have to disable/remove it from the sources list

Follow this guide for fix - https://elementaryos.stackexchange.com/a/24105/12483

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