I was looking for a simple timer and after insufficient research and blithe inattention installed gnome-desktop-timer from the ubuntu repository. This installed what looked to be a completely new desktop, (including network-manager which assumed complete control of my network settings and made a mess of them).
So I purged and autoremoved to roll back but there are nasty little bits hanging on it seems.
Now I get complaints from inotify that my dbus request for notification can't start because I'm out of disk space -- but I have lots and lots of space.
So what happened and how can I fully rollback that nasty install? Can I just remove dbus and reinstall that? If I have to re-install Ubuntu MATE I can find time to do that, but would rather not.