Sudo apt-get update errors when using command

I have just installed Linux on a chomebook and I cannot install Lutris due to error messages. I am an extreme boomer at this and I would sincerely appreciate the help.
The first step is to type “sudo apt-get update”
This is what shows up
W: The repository ‘ xenial Release’ does not have a Release file
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch 404 Not Found (IP address)
E: Some index files failed to download. They have been ignored, or old ones used instead.

How do I download Lutris for linux?

This error is entirely unrelated to Lutris; your package manager has a PPA (additional repository) for Gwibber configured to use Xenial (2016 release of Ubuntu) which is missing from the PPA (the last release was in 2011; there appears to be a slightly newer remake of the app named friends-app in another PPA, but it’s still only 2013, so I doubt if the binary packages are still usable). If you’re not using this Gwibber app I suggest removing the PPA (otherwise you need to fix its repository version).

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