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OK ... #Linux help needed.

I'm trying to update my 20.04 machine to 22.04, thence to 24.04. I've run:

$ apt update
$ apt upgrade

But I'm getting :

E: The repository 'https://repo.skype.com/deb stable Release' no longer has a Release file.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

Then when I try:

$ do-release-upgrade

I get:

Checking for a new Ubuntu release

Please install all available updates for your release before upgrading.

Help?

Should I somehow work to expunge all knowledge of skype (and I'd be more than happy to do that) or should I somehow force the upgrade?

TIA