With Debian, we need to look elsewhere, too. They are not very compatible with Debian, even if people try it over and over. I just cannot trust PPA on Debian. I always avoid it and haven’t used it since I broke my Debian a long time ago by being smart enough to put PPAs onto the OS.
Ay caramba, I thought they are at least safe on Ubuntu! Seems like PPAs seem too nice to work properly, as they should, all the time.