- baloo KDE4 (http://packages.ubuntu.com/source/zesty/baloo) - few reverse depends, except for the old kdepim4 (as mentioned next).
baloo is in kubuntu-meta as a recommends and the seeds, but those can now be removed I assume.
- kdepim4 (http://packages.ubuntu.com/source/zesty/kdepim4) - obsolete and not supported upstream, and would block removal of baloo. No reverse depends except on itself.
Complete listing of kde4/qt4 dependencies (as per darinmiller):
Using command line function: function d() { apt depends "$@" | grep \'kde4\|qt4\|qtgui4\' ;}
I searched the Zesty seed packages: http://bazaar.launchpad.net/~kubuntu-dev/ubuntu-seeds/kubuntu.zesty/view/head:/desktop
And found the following packages dependent on the kde4/qt4:
ibus-qt4
Depends: libqtgui4 (>= 4:4.8.0~)
phonon-backend-gstreamer
Depends: libqt4-opengl (>= 4:4.8.1) Depends: libqtgui4 (>= 4:4.8.1)
breeze
Recommends: kde-style-breeze-qt4 (= 4:5.9.2-0ubuntu1~ubuntu17.04~ppa1) kde-style-qtcurve-qt4
python-qt4-dbus
libreoffice-kde
Depends: libqtgui4 (>= 4:4.8.0)
- ktimetracker
- baloo-utils
- apturl-kde
- amarok
- ktorrent