Some time ago I installed kxstudio on my ubuntu system. I'm not sure if I was using it or not :) But I'm trying to upgrade to a new ubuntu and I get ppa not found problems so I'm trying to remove it. It appears have these 2 ppa's:

 /etc/apt/sources.list.d/kxstudio-debian.gcc5plus.list:deb http://ppa.launchpad.net/kxstudio-debian/kxstudio/ubuntu xenial main
/etc/apt/sources.list.d/kxstudio-debian.gcc5plus.list.distUpgrade:deb http://ppa.launchpad.net/kxstudio-debian/kxstudio/ubuntu xenial main

But, I have no idea how to remove them. I've tried ppa-purge with a number of variations of kxstudio, kxstudio-debian, etc but nothing seems to work.

Suggestions?