Zorin Software Update app broke because unsigned repository

When I apt update, I get this error:


E: Failed to fetch http://deb.volian.org/volian/dists/scar/InRelease  Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://deb.volian.org/volian scar InRelease' is no longer signed.
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.

How can I fix it?

The github lists an interesting solution:

Can/Should I remove the http://deb.volian.org/volian/dists/scar/InRelease repository?

EDIT: I commented out the/etc/apt/sources.list.d/volian-archive-scar-unstable.list repository, and that seemed to fix it, but I'm not sure what this repository is, or if it's important or not.

Removing it or commenting it is fine, too. Volian provides Nala, an alternative package management for CLI to apt (not to be confused with APT) and is a repository that is only added by the user.
It did not come with your install.

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