I just upgraded a computer from 10.10 to 11.04 using the
do-release-upgrade command. (This was the first time I've actually done an upgrade.) I had a few PPA's in my setup, which got removed from my configuration during the upgrade. I've gone back and re-added those PPA's (like Thunderbird stable and Flash 11), and updated and upgraded. Now when I look in Synaptic, I see a lot of "orphaned" (?) packages in the "Local" origin. I can "Mark for Complete Removal" on those packages, but then I can't "Apply" those changes. What's going on here? Is it possible to clean these out to make the system "clean?"