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So I go to sudo apt update today and:

E: The repository 'http://ppa.launchpad.net/wireguard/wireguard/ubuntu focal InRelease' is no longer signed.

Oh, nice. OK.

So let’s try removing it, then:

sudo apt-add-repository -r ppa:wireguard/wireguard

Nope! (You didn’t think it was going to be that easy, did you?)

Cannot add PPA: 'ppa:~wireguard/ubuntu/wireguard'.
The team named '~wireguard' has no PPA named 'ubuntu/wireguard'

Actual fix:

sudo rm -i /etc/apt/sources.list.d/wireguard-ubuntu-*