Sudo apt update

Hello everyone, Im a new user to this OS and i've came across an error when using sudo apt update. How can i fix it?
E: The repository 'Index of /ubuntu/23.04/prod/ lunar 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.

You added a repository for Ubuntu 23.04 Lunar Lobster.
Zorin OS 16 is based on 20.04 Focal Fossa.

Please remove the repository:
Launch Software & Updates
In the other tab, scroll to that repository and click on it to select it.
Click the Remove button.

That will resolve that error.
You now can search for a Focal repository for the app you were looking for.

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Thank you so much that did the job!

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