Comment 13 for bug 1257505

> gnome-control-center : Depends: libgoa-1.0-0 (>= 3.7.90) but it is not installable

it seems like the ppa needs to transition to the new gnome-online-account soname that got uploaded to trusty this week

> Yes, gnome-control-center-unity is obsoleted by these changes, we are probably missing some dpkg magic to uninstall that on upgrade

The new g-c-c and u-c-c should Conflicts on gnome-control-center-unity since neither the binary works with neither of those