Comment 4 for bug 995113

I wonder is it always desired that ppa-purge reverts changes to sources.list.d, if apt-get fails? What should it do to the packages that were successfully downgraded/purged in case apt-get failed due to some other packages (or is this a realistic case)?

What is ppa-add? I don't have it in Trusty. Why did first run of ppa-purge fail? Maybe the PPA was commented out before that for some reason?