Comment 4 for bug 1602052

Just thinking out loud here, but I think Zika may have the most sensible and certainly simplest solution. We already warn that we're disabling PPA's so maybe we could warn in a very prominent manner (bold font) that the user would be wise to actually purge PPA's. I need to perform a few upgrades in the very near future so I'll catch a screenshot of what we currently say.

One of the greatest quandary's to me is how we'd handle PPA's that had previously been disabled w/o downgrading or removing packages installed by that PPA???? I think there would still be a .save in /etc/apt/sources.list,d representing such PPA's??????